This hole cutter probably works very well for its intended use: cutting drywall. I pushed it, using it to cut a hole in vinyl siding. If you do something like that, watch your wrists, because it's liable to catch quickly. I learned that slower is better; don't try to force the tool, and you should be fine.
Set up is a little tedious to get the proper radius on each cutting blade. Blades cut ok and could be sharpened. Downside is this thing could be very dangerous if you don't maintain a stable work surface, try to cut too quickly and don't keep body parts and clothing away from spinning blades.
It's a little tricky to setup, but does a good job. Used it on thin plastic and 3/4" plywood, and it cut well through both. Smoked a bit going through the plywood, but I didn't give it much if a chance to clear chips. Cuts well with minimal tear out. Great for rougher jobs, not for fine finish work.
This is a well made dual bit cutter. While I wouldn't recommend for production work on hardwoods thus is perfect for plywood, sheathing, ceilings, etc. It is critical that you use a slow speed to set the circle and not use excessive speed to complete the cut. I used to cut 4" jlle in 3/4" ODB shearing for an electrical box to mount a security light. Handled the OSB nicely with minor chipping when starting the cut. All in all solid for the price.