The 2nd wind is basically a normal pump that happens to have a co2 option at the end of the pump. Is the hand pump the best on the market, not at all, but it will get you home if you run out of co2.. I have these pumps on all my bikes and have yet to be stranded even when I have run out of co2.. They sell a mini version or full length version, carbon and aluminum options too.. The only downside is that they are presta only, but for most of us that is not a problem.. Most likely the mixed reviews were on the 2nd winds from a few years ago, they did not work so well, the new models have no issues..

http://www.genuineinnovations.com/bi...=3&prodid=1092
http://www.genuineinnovations.com/bi...=3&prodid=1091