I've been using the GlucoWatch for a week now.
I've received some very good information from the GlucoWatch, but not without some pain. You perform some initial steps to prepare the inside of your forearm for the watch. You alcohol swab your arm, put the GlucoWatch AutoSensor on the back of the watch, and stick the whole assembly to your arm. There is a 3 hour "warm up period" during which you get no feedback. There is a slight tingly feeling while the watch is collecting Glucose. The slight voltage pulls the Glucose out of your arm and into the Collector pads. I find this tingly feeling a bit uncomfortable. According to support people at Cygnus (the GlucoWatch company) this is normal, and depends on how fair skinned and sensitive your skin is. I'll probably only use the GlucoWatch once a week because I find this tingling uncomfortable enough to deter me from using it daily. Also, after you wear the watch for the full 12 hours (it shuts off after 12 hours) you're (At least, I am) left with two red rashy marks that look like mosquito bites. These took a full week to fade, and are still slighly visible. I'm using Cortosone (sp?) to treat the rash.