This is one big reason I recommend and stick with Intel or Samsung.
Samsung has top notch reliability, proven by their deal with Apple.
Intel has top notch reliability, proven by their use in enterprise data centers.
M4's are great drives if priced right, IMO. I want that SSD toolbox though personally if a Samsung or Intel is within $100 range of a Crucial.
Bottom line:
Toggle nand + SSD toolbox + #1 or #2 SSD reliability = Samsung, and no others on the market today.
Major reevaluation needed once the Intel 520 arrives. As of today, Samsung is the king of all with Intel as a close 2nd.
Disclaimer: I use Intel (right now at least).