to buy or not to buy (ultrasonic record cleaner)

@barnettk   First of all, your system is lovely.  Do enjoy it in good health.
I wanted to add a suggestion that in your further search be certain to check out the Degritter.  I have been an audiophile for near 45 years, growing in understanding through all of them.  I still have more to learn and always take the time to research and understand the technology and philosophy behind the products.  Over the past several months I did just that on the category of ultra sonic cleaning and finally landed on the Degritter as my choice.  It just arrived yesterday and this weekend will be a fun test on cleaning some of my noisier (call it, vinyl noise) albums and some of my quietest and best sounding albums.  I found, during my research, that the Degritter made the most sense because they developed it from the ground up, applying ultra sonic technology to the world of vinyl record cleaning.  In other words, they didn't take existing ultra sonic tanks meant for other cleaning purposes and apply those to vinyl records.  They researched for the proper ultra sonic frequency combined with the appropriate wattage, location of the devices, rotation cycles, etc. and developed a completely bespoke machine specific to vinyl record cleaning.  I encourage you to research this brand.  The audiophileman did the most thorough review that will be very helpful to you.  It's a long read, there are Part 1 and Part 2, but well worth the time. 
Degritter Ultrasonic Record Cleaning Machine - The Audiophile Man
I posted the link, for your convenience.  Enjoy your journey to the next level of vinyl SQ.

Keith Monks is the very best of all vacuum type RCM, there is no doubt about it.  However, it is not ultra sonic and thus can not clean down to 2-5 microns (the deepest bottom of record grooves).  There are many opinions on which method to use and in some cases people choose to use more than one method, basically as a regimen.  All are worthy of researching.  Do enjoy the process.

By the way, I just completed a dozen records cleaned in the Degritter.  My tubes are warming up now and I'll soon be playing some records to listen for proof in the pudding (so to speak).  I have to say, the materials, build quality, and fit & finish is absolutely first class.  The menu and operating system are very simple to navigate & operate.  Functionally, this machine is an absolute gem.  Listening to some records today should be good.  Listening to more, later tonight, should be even better.  Music always seems to be better in the evening, when the light is a bit dim.  Maybe a couple glasses of wine adds to that...😊

@barnettk   I am glad to report to you that after cleaning my first dozen records yesterday on my new Degritter, the results are rather staggering.  I cleaned and then listened to several records that I am very familiar with in order to have the best understanding possible.  I used records of various SQ levels in order to get a grip on the range of what the machine can provide.  What I found was that with records of less than satisfactory vinyl quality but great music and detail (such as true vinyl noise due to lower grade pressing and/or grade of vinyl) that problem can not be eliminated.  I used the album from Jeff Beck, "Truth" for that example  However, where there is noise from micro sized debris and remaining contaminants from previous cleanings, the noise floor is substantially reduced to nearly zero.  That aspect was very impressive.  More importantly, is what I realized in musical information.  The finest nuance of information was revealed in an almost startling way.  Guitar strings trailed off like I have never heard before.  Sizzle cymbals seemed to go on forever.  Layers of musical information had an overall improved dimension, whereby everything seemed more well defined.  
My system is sensitive and of very high resolution.  I have always heard a depth of music that I had thought was fabulous.  I heard it better than ever last night.  I had no idea just how much I was missing by only using a vacuum RCM.  Ultra Sonic is the state-of-the-art for vinyl record cleaning.  There is no two ways about that.
Enjoy your forthcoming purchase.  It easily qualifies as a newly added component to my hi-fi system.

@barnettk   I recently changed from a high mass turntable, Micro Seiki, to a completely different philosophy.  I chose the latest top end unit from Rega, the Planar 10.  I had purchased a Lyra Delos cartridge for my Micro Seiki just a few months prior so I thus chose not to get the Rega cartridge and instead carried over my Delos to the Planar 10.  I have it placed on a Symposium Acoustics Ultra Platform (which is the top platform on their Foundation Rack Ultra).  I also removed the feet from the turntable and am using Symposium Rollerblock Jr HDSE.  It's a killer isolation and vibration control system.

I would say you'll find it to be about the same level of noise as most vacuum RCM.  I have my unit in a separate room from my listening room so eventually I will have a record being cleaned/dried while listening to some music.  It would be way too loud to have cleaning under way while listening to music if the machine were in the same room.  It is not a noise problem unit and is what I had expected.  Especially after having lived with a Nitty Gritty RCM for so many years.  Just too loud to use while playing music in the same room.
Also, if you do buy a used record it is wise to clean it first via a vacuum RCM and then follow with an ultra sonic cleaning.  I got that from reading up on the matter and it makes perfect sense.