It may have taken some time to get the routine, but once done, the AC-Mobile is the best BG monitor available. The FastClix is the less painful of all lancet devices. I work in health services and move around quite a lot, and I can test with one move, without a problem. Cleaning the sample spot should be the norm, not only for accuracy purposses, but for hygiene as well. And if anyone gets several errors per cassette, just call their customer service, explain, they'll ask for the device's serial number and promptly send you a replacement, free of charge. Please believe, me I had problems with one cassette and that's exactly what I did. Register your device and they'll send you carry cases, batteries, logs etc.