Two strikes is enough [SEP] This e-file works really well, except mine only rotates in one direction. It has a switch for changing directions but mine only spins clockwise. You might not think it's a big deal but it is actually helpful to have the option to switch back and forth. I'm exchanging it and will update this review once I get the new one, which hopefully will work as advertised.<br /><br />The included bits are decent, although only the sanding bands work efficiently on UV gel overlays. I bought a separate ceramic carbide bit to use on my UV gels (2/32 is the correct bit size). The included metal bits work fine on natural nails.<br /><br />EDIT: I received my replacement file a few days ago and it does rotate in both directions as it should. It is a little balky when changing directions and requires trying a few combinations of flipping switches and turning knobs before it will start up again. Really serious nail enthusiasts or professionals should probably invest in a higher quality e-file, but for hobbiests and home users, this one is pretty good.<br /><br />EDIT 2: Just a day after my last update, the replacement drill died. It's only been used 3 times, and I had it for less than a week. The power light comes on but that's it. So back it goes, and off I go to find a different drill, probably for more money but hopefully with more reliability.