Mooncat, I apologize ahead of time, I have not used one. However, I did do a lot of research on them as I thought about getting my daughter one. I'll tell you that the only real negatives I found were the battery life, which I believe was around 4 hours of use, and the fact that you have to use a phone or tablet out on the ice which also makes you use a battery. Other than those two things, all the reviews I've seen and videos I've watched looked very promising. I haven't pulled the trigger yet on a purchase, I was hoping they would improve the battery life and reduce the charge time. I do like the fact that there is no cord to get in the way when you bring a fish up, and some of the mapping and upgradability (not a word) are promising. I also like that I could use it in the kayak in the summer.
