I have the 6.5 hp tamper from harbour freight and it runs like a beast. The throttle setup is a little flimsy, but for an extra $80, they'll give you a one year full replacement warranty. i think $150 for 2 years. If you have any problems, you take it back and they'll give you a brand spanking new one. Mine starts first pull every time and compacts just as good as the smaller Stone and Whacker tampers I've used. I bought it because it was cheap and I thought it would be good for the final couple lifts and tamping pavers. I'd like to get a bigger reversible tamper sometime this season, but for now, I'll be renting those for bigger jobs. I was talking to another guy who does just concrete, and he liked them so much, he went and bought 4 of them...one for each truck. Can't beat the price!