Review (4/5): Practically perfect
First, I want to say that I am not a professional nail tech. I bought this because I am trying to manage my own nails during this pandemic. I started with another battery operated drill set but I felt it didn't meet my needs because there was no emery board drill bit and I couldn't adjust the speed. This set has everything you see in a professional nail salon. You get the full spectrum of drills, with emery board bits. There is a quick start guide that tells you what each drill bit is used for (although it doesn't explain what the white drill bit is for and I still haven't figured it out). The cord is just long enough for my needs but it would be better if it were six inches to a foot longer. It has adjustable speed settings.
My only complaint is that if you are using this for your own nails, the on/off switch and the speed wheel is further down on the cord instead of being on the drill itself. I found myself fumbling at times turn it off while half of my fingers are wrapped in cotton balls to soak off nail dip. This wouldn't be an issue for anyone using the tool to do nails on other people. It is just a minor but annoying drawback for those of us who are using the tool to do our own nails. All in all this is a really great product that has stood up to me dropping it several times and it is priced similar to much less sturdy drill sets and drill sets with fewer features. I would definitely recommend this to others.