I just received the air power hammer P-50 from China today, right now I'm really fond of this thing, after having run it for a while I found that it likes moderate speeds to have a nice controlled & regulated hammer motion, to fast & it'll "float" out. the hammer part at the end of the piston is adjustable with a very fine thread to "dial in" the hammer action. it has a foot feed & a hand control both of which work very smoothly. it weighs just under 2 lbs. & the only issue I've found so far is the screws that hold the unit to the wood base was loose & it flopped around a bit, it did have a small chip out of the base as well (very minor) I got it for the single bid of $100 + $45 shipping & tax. the Jensen #25 runs it easily.