As much as any one tells you to get an SSD without TRIM don't.
You can butter it up and you can try and say that it doesn't affect the drive too much but the cold fact is it does.
Back in January when TRIM was being introduced I made the silly mistake of not doing my research first and got a Corsair X32 pre TRIM firmware. It was the worst mistake I ever made. Due to me constantly tweaking my hardware (drivers OS etc) it would slow within a matter of weeks. Not months as people say. Secondly when you benchmark it you ruin it. When benchmarking you read and write tons of data to the drive. Within the space of three benchmarks performance will already start to degrade.
The biggest problem is how awkward that can be. On a SATA based SSD performance can only be restored in a couple of ways. The first thing you then need is good imaging software. You then need to continually remember to do a backup to an image which is a faff. Then you need to burn a Diskpart utility disc (linux distro) and boot into that and unlock your drive (hot plug the power) before booting from an imaging disc and restoring it. It's a major hassle.
I don't know about these revodrives or if they come with a utility but I do know if they lack TRIM or something that does the same thing I would give them a very wide berth. The Crucial C300 drives (I think that's what they're called) run the revos very close, cost less and have TRIM. Mind you so do any of the Sandforce controller SSDs.
As I say dude, the secret to buying ANY SSD is to do your homework first. Not look at specs and say "no TRIM". Make sure you're covered because nothing sucks more than messing around with SSD all the time.
Apparently the new Kingston SSD have a way to TRIM (well, the same thing) in RAID. At which point they will probably work out cheaper, go faster, and have the ability to maintain their performance.
Tom knows more about this