to buy or not to buy (ultrasonic record cleaner)

I went ultrasonic a couple of months ago and found a unit on Amazon for $200. Comes with a drying rack and can do up to eight records at a time. Bought some Degritter fluid from music direct to use in the water and all is good.  I find it certainly makes a difference but whether it makes a significant difference between my old Spin Clean and this unit I’m not sure. For 200 bucks I don’t really care. LOL

@whart2 thank you for the reply.  Very nice cleaning setup, I need to do some basement remodeling to accommodate something like this.  For now my US lives on a borrowed table whilst I do work on either side.  Gotta pay the bills of course.  I certainly will plan to do some better visual and preclean before my next batch of US.  Great tips, thank you.  The Monk machine is very interesting, I had not seen nor heard of one of those before.

For those that already have extensive experience with an ultrasonic, is there any prep you do prior to use?  Visual inspection for any blemishes or material that probably should be removed with a fingernail or something?

I bought some used ones the other day and ran them through my (admittedly low-end) ultrasonic and they are pretty clean and shiny now, but, I found the cleaner won't get rid of things like the chunk of chewing gum (small, almost not noticeable) that some prior owner left deposited on the vinyl. 

Of course they also don't seem to be able to clean up 100% (although considerably) the results of many many abusive plays over the years by owners who had probably played them on groove-grinder turntables with dust all over the stylus and/or coin taped on the cartridge head to keep the needle in the groove.  The LPs quiet up considerably after a clean in the ultrasonic but can never be made perfect again if they have been damaged, at least in my opinion.