Well, on the Gerber front I've read some reviews where people had trouble getting defective items replaced, but only a couple. Every company seems to have issues with customer service from time to time, so caveat emptor.
I have found out that SOG's tools are customizable. On their website you can order specific parts and change them out yourself
http://sogknives.com/store/components.htmlthis gives you the ability to create your own tool within certain limits, although it will be slightly pricier.