Hi cac,
I've been a member of TAXI on & off since 1995. I can tell you that they do what they say they do. Their critiques do help most of the times, at least they did for me. And yes they're a bit expensive, so unless your songs are 100% ready to be pitched against the big boys, hold off on your membership.

I've met Michael Laskow (president of TAXI) and he's a very nice guy truely looking out for his members. But the main thing you need to know about TAXI is that they will only forward songs that fit exactly what the listing company is requesting. Not something that's close, but exactly. That's what's made them so popular and respected within the industry.