Buyer beware. I purchased a $1500.00 Maytronics Dolphin, and my experience was an absolute NIGHTMARE! We tried using it in our inground pool on a Saturday, and the unit simply wouldn't move more than a few inches. Given the unit was brand new, we checked to see if there was any packing material prohibiting the movement of the robot, and that wasn't the issue. I have owned 8 houses with inground pools, and have owned many Maytronics robots, so this isn't a question of me being inexperienced with how these things operate. When I attempted to return the unit (and I wasn't interested in a refund...I simply wanted the functioning unit that I paid a small fortune for), I was told by Kent at the Plaistow store that they would not give me a functioning robot. Instead, I was told I had to leave the M500 at their store for "Service". I remind you that this unit is all of 24 hours old! This is unacceptable to me. I have no interest in a product that isn't working on day one, and needs service. Again, before you give this store a nickel of your money, you better make darn sure that you never have to return anything, because if you do, it will be a nightmare of an experience for you. I am filing a small claims court case against this AWFUL company! Be aware that this company has several locations, all owned by Patrick O'Keefe, and you should expect the same AWFUL service at every one of Mr. O'Keefe's locations! This company is yet another example of why brick and mortar retailers are dying a slow death. Horrible company, that you should steer clear of, unless you want to be extremely inconvenienced and frustrated!