We purchased this tool and the pads in order to finish our DIY concrete countertops. We used the Cheng products for pretty much everything else.
The good: It was the least expensive wet polisher we could find. We have ground nearly 40 linear feet of countertop through all 8 passes without a problem. Even without the motor heating noticably, despite the fact it bogs if you put too much pressure on the head. The supplied pads are tougher than you might guess and only the 50 grit (which has been engaged on the concrete surface for about 40 hours - we were grinding pretty deep) shows any wear at all, but even it looks as though it could grind at least 2 more sets of tops as big as ours.
The Bad: The water feed system is pretty much crap. The "valve" does not allow much in the way of fine adjustment. There is not quite completely off, more than you probably want, and fully on - all within about 3 degrees of rotation from the stop. The parts are thin and cheap. We have had to completely replace the hose attachment that came with the tool. It brust 4 times before the remainder became too small to cut back. The brass nut that is supposed to keep the feed tube elbow cracked and then broke off. The Switch is rather awkward to operate too. Finally, the velcro separated from the pad, and I had to glue it back down with some tougher adhesive.
The Ugly: Yes, it is double insulated and has a GFCI attached, but you really need to wear rubber gloves when you operate it. The GFCI is not sensitive enough to actaully pop the circuit when a stray current (which emanate from the switch and the hose connection) gives your bare hand the occasional, disconcerting, buzz.
Within all the above limitations, and if you don't mind the occasional soaking when the hose bursts, or zap through your hand, or small repair job to get it going again - it did do the job. Since we aren't very likely to need the tool again... well, ever... and since we could not locate one to rent in our area, it gets a good rating despite it's issues. I wouldn't recommend this tool if you are planning to get into the business, but for a 1 shot DIY, it didn't suck. Get more detail about SECCO WV5GRIN 5-Inch Wet Polisher Kit.
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