I had a pilledriver one, it was a perfectly good cpu, I would buy it again. If I remember back then it was the best overall performance per dollar, the alternatives if I remember correctly were i7-39.. and i7-38.. and were at best 50% more expensive for 10-15% more performance.
The piledriver would win the bang/buck race back then because of the 6-core part was reasonably priced and unlocked for overclocking, so people would overclock them to beat the more expensive Intels at a lower price, but that ignored the pretty high power draw and the need for beefier more expensive coolers.