I was very happy with my Dolphin Diagnostic for 2 years. Then the 3rd year it started to give me trouble and I learned that they are rather grudging about the warranty. I shipped it to them twice. Twice they claimed there was nothing wrong. but it wouldn't climb the walls anymore and kept getting stuck. Their suggestion? That I tape raw lead weights to the handle. I said "No. I'm not putting raw lead into water my children swim in. Not happening." Eventually they sent me a new unit but it never worked very well, and I replaced it with a Blue Diamond.

I have a grudge against Dolphin and would not buy one of their cleaners again.