Write endurance isn't really an issue anymore. Maybe in the '90s it was. For a 128GB drive, you would have to write around 40 Gigabytes a day to it for it do wear down in 5 years. From my experience, failure rate is strongly correlated with manufacturer and model. (Same in the case of hard drives.)
I thought this was a good article for people considering using SSDs in servers:
http://www.tomshardware.com/reviews/ssd-reliability-failure-rate,2923.html