I have the Grizzly one and it works ok but I did made some mods. First, I use some 1"x1" angle iron over the tubes inside the tube holder to make sure they don't get dented. Second, the tube holder is about 4 mm off center from the hole saw shaft. So I had to put a file underneath the 1"x1" angle iron on the "V" side to raise it up so the centerlines intersect. Third, I had to make my own scribe mark for the angle indicator since otherwise, you have no idea what angle you're at. Fourth, the hole saw adapter that came with it was not even close to being square nor concentric (outside threads to inside threads) so I had to use the adapter that came with my Rigid hole saw kit (6 pieces, $38 at Home Depot). Fifth, the bolt that secures the tube holder stripped without nary a pull so I had to get a replacement. Sixth, not really a mod, but keep in mind there are both metric and english bolts on this friggin' thing. So, needless to say, lots of issues. But it does work fine. And Grizzly has been really really responsive to my problems which doesn't make up for a crappy product, but at least has made it workable.