Yea man I have been in a few different accelerators, a couple of small ones and now I am in AngelPad and I can tell you the difference is mind blowing.
I don't believe I got any value (except some money) out of the smaller ones I went into, where as AngelPad the value is HUGE. Stick to the big accelerators, there are a log of cowboy shops springing up and their value is limited at best.