I just got the LaCie Rugged 128 and got it hooked to my 2011 27" iMac via Thunderbolt. While the drive runs fast (boot time went from 60 sec to 15 sec) and there are no sleep issues, system report registers the SSD as a SanDisk U100 (not Crucial as reported in this topic).
Could it be that LaCie switched to a different brand of SSD? I've read some really bad stuff about the SanDisk U100 - most about the random write performance. I don't notice anything specific and everything runs much faster than my internal WD drive, but still.... I bought LaCie based on some good reviews to use as a boot drive. Sure, it's not the fastest SSD out there, but really good for the price.
However, if LaCie switched from Crucial to Sandisk U100 - it is quite possible that these reviews are not applicable. People go so far as to compare the U100 with mechanical drive speeds.
I do not notice it - the system is faster, Blackmagic shows scores of 290/380 (although I'm not sure if Blackmagic measures random writes/reads)
Just thought I'd give a heads up to everyone. Not sure about the U100 performance and, again, no issues here - much faster than the 7200rpm drive, but worth mentioning.