I bought one when they originally came out.  Worked great.  When it was only at one or two fish, I would only catch 1 or 2 fish, but when it was at 3 & 4. I did very well most of the time, depending on the weather and barometric pressure too. That is Bass fishing.  I sold the old one at a good price that of course still worked, to a guy who wanted it and I bought a new one at the same time.....Will keep using them as long as they keep selling them.