I purchased a Hydromax on November 1, 2007. For full review, email me, timchileno, on ebay.  Drill cost me $6,500 on ebay, $1,900 shipping, $650 customs fine for poor document management by PMC & Assoc, in all including extras I purchased with the drill, I have over $14,000 invested and still counting. The drill is worth about $2,500, no more. To date, I have drilled only one partial well to 58 feet and the 6 cubic meter 3 per hour(3000 lts) Chinese made water pump included with the drill set lacks potency to float up the cuttings so the drill bit clogs and binds. The Thailand made water pipe he calls "1-5/8" DRILL PIPE", bends regularly with any drill bit contact made with rock. I have become a regular at the steel scrap yard, the discoubt store motorcycle trailer is bending from the drill's torque......Photos and complete reports available, free of charge and it is my pleasure to send them to you. Save your money and save your time unless you only have to drill 1, 30 foot well x 6 inch hole in clay. Sand, granite, quartzite and cobble stone are way out of the limits of this drill.  Maybe this will make "BOB", honor his warranty or at least answer me! I certainly would have left negative feedback but received the drill after the 60 day feedback limit had expired.  Tim Andrus (timchileno)