Compact T & Ts we had teething problems with the selector control and charging issues, since then all ok. I prefer these to the other manufacturers for ease of calibration and reliability, I have had punctured keypad membranes, battery charge and velcro issues!. Long term may even be cheaper if i can get my hands on those cheap probes (sale/wanted forum. The algorithm and pump ass. seem to be industry standard and are being incorporated into some very large manufacturers at the moment.