Not sure what MS's policy is on that. If you were' to clean up that install you could clone it over but be aware that since it was originally built off an original XP installation(I assuem so anyways), it will not be properly aligned. You would need to use Paragon Alignment Tool(PAT) prior to cloning it. Be cautious of the clone tool used as well since some have been known to destroy alignments even when correct in the first place.
If you use W7 to reinstall from the start?.. alignment is not an issue as W7 will align properly by default.
Just make sure that if the drive is previously used/tested that you perform a secure erase first as that's the ONLY way to wipe the drives mapping and start out-of-box fresh again. Reformatting will NOT be the same and just build on the original mapping which will inevitably lead to Durawrite throttling. I would check the OCZ forum out with this being the first stop. Secure erase methods are in there too.
http://www.ocztechnologyforum.com/forum/showthread.php?79848-THE-BASIC-GUIDE-amp-FAQ-ABC-for-OCZ-SSD
As for the performance compare's?.. figure about 85% of the original 34nm drives performance. Most loss is in the small files and the incompressible write speed capability.
Most would never know the difference when just using the drive and only seriously heavy multitasking, vid writes(which should be avoided due to eliminating the drives built in compression allowance because of the nature of that incompressible data hitting more nand at the physical level) or the use of incompressible benchmarks(AS SSD/CDM3) would ever give you a clue.
Not really as big a deal as everyone makes it out to be. Lifespan shouldn't be a concern either because the drive will be small, slow and obsolete like a little USB stick by the time it becomes an issue. Good Luck and happy reading.