I'm very happy with mine. Bought it in August of 2010 as my old one was losing its gas. Big difference from what my battery was performing at, at that point. Also better than what my battery life ever had been. For me it was worth the purchase and I've had no problems with it at all.
but i read some reviews that the life of this seidio battery is short...sometimes it didnt last more than 6 or 7 months.
but i made my decision and im going for the standard oem 1500mah batterry