Just got it, so I've only used it a day so far. I love that it clips onto my purse so it's easy to access. It's worked well on the counters I've tried it on so far, including a somewhat thick kitchen counter. The only complaint I have at the moment is that I almost lost it already on day one! I guess the spring is loose enough that it comes open rather easily, and it unclipped from my purse without me realizing it until I got inside my house. Luckily when it came off it was in the car, so I didn't lose it, but I wish there were a way for it to stay latched when it's closed so I don't have to worry about losing it.