I'm still using my Gerber cool tool....after giving a few days thought I think it's pretty close to perfect. That mini cresent is handy for all kinds of stuff.
I was bought one nearly 20 years ago - early enough NOT to have the 8/10mm allen adapters - and I still carry it on every ride. It certainly works well enough for trailside repairs, and has got me out of a tricky situation several times.