Just to bring you up to speed (no pun intended!), I'm now on my third SSD drive on the MacPro.
If you look back on previous posts, you'll see i was so impressed with the SSD in my MacBook Pro, I ordered one for my main production machine. It's a 256GB SSD from Crucial memory.
I first one failed on me about 2 months ago. Very little warning but ended up I couldn't boot. Couldn't see the drive at all. Extracted the drive and couldn't see it in an external drive enclosure.
Crucial were very good and their automated returns process meant the drive was swapped out with no fuss.
The replacement drive failed about two weeks ago.
Again, a replacement was issued with no fuss and I've just installed it into the MacPro.
Touch wood, the original SSD in the MacBook Pro has behaved faultlessly. I just need to keep an eye on it more closely and ensure my backup is up to date. Luckily, I have a second drive in the MBP so I'll be running daily SuperDuper backups - most of my important data is on external drives or in the cloud anyway.
Anyway, back to the MacPro...
The drive is installed and working. I'll do some performance testing between it and the drive that's been in the MacBook Pro for a while and report back.