Yes I still use them and there is kind of trick to keeping it accurate. If you do it you will have no problem and I have used mine for a couple of years now. I keep one on my Cobalt tank at work and the other one on my 65 gallon Red Eye tank at home. I have measured them with other digital measuring devices and it seems to be within +or- one degree. Close enough for me. Now here's the trick. On the Dart frog tank due to the high humidity you have to keep it away from the plants. Once a week I blow dry it out with one of those compressed gas canisters you can get the office supply store or just leave it out for awhile to dry out. Every so often I take the one out of my Red Eye tank but only when I'm doing a major house cleaning. I have the Zoo med Repti-fogger hooked to them and then the heat mats. This also helps keep those cheap Repti-foggers working for a long time because they are only coming on for a few seconds at a time and even then only 3-4 times a day. So they are never consitantly running. I can go on vacation for a few days and I don't have to worry about my frogs. I feel it gives peace of mind and is worth every penny.