Celestion SL12si any thoughts and history?

I made a similar purchase a year ago - but paid a bit more - $275. Best money I ever spent on speakers. They have the traditional 'polite' Celestion sound, great imaging, tight bass (such as it is), etc. I'm curious how SL6's would sound in the same room, or in other words, whether the extra driver helps or hurts. I may buy a set just for fun to see.
Only downside is you need a powerful amp - those Celestions are very inefficient. And forget getting replacment parts - particularly the tweeters, which can go bad on you.
Enjoy!!
Joe

Well ... they arrived and I'm wondering how much power I need to get the very tight bass pumping. I'm thinking maybe a 500 watt Hafler... not too pricey as these speakers are definitely not finess detailed. My wife actually wants me 0to use our Mission M70's and put these up for sale.... but now I'm intrigued as I can sense some performance to be coaxed out of them...any other amp suggestions used in the under $500 arena?

So you're the guy who outbid on the 12si's. I own the SL6si and ran them with a 100wpc HK amp. Incredible vocals if you like James Taylor, Bonnie Raitt, etc.
Enjoy