How much and which model Crucial did you get? Been on the fence for my Asus gaming rig that has Live on it (my heavy portable Live set up). I have a 500GB HDD in there and would probably go for either 480 or 512 for SSD drive.
In regards to the lockups, did you do any reading about things to do once set up? I don't know how different it would be from a MAC perspective. I know that for windows there are some things to do/move/change (turn off trim (or was it on), move swap to other HDD, etc...) but that is all related to doing an image restore.
Speaking of restore, highly recommend you do an image backup of your HDD (this goes for anyone on a laptop or desktop) to an external USB/eSATA/FW HDD enclosure at least once every couple of week so if your drive dies, you won't be too far behind in data loss on the HDD. I back my desktop to my WHS nightly and do images every couple weeks, I should be doing it weekly since my non-Live system is on 24x7. My live desktop is in need of a backup but want to get EIC 2 packs loaded before cleaning off some files and backing it up (I have stuff all over that I need to organize lol....).
And you will see a noticable difference on performance, that's for sure. I just can't justify one of them yet (at that capacity) due to cost (~$480+ for one that size if I recall). They seem to be getting better quality-wise but I'd still do weekly image backups in case you have to restore if it dies (could in <1yr, >1yr, <6 months lol, crap shoot but not so bad nowadays). Now all you have to do is get an external for the old boot drive in 2.5" form factor