RIPOFF...I hope this review will save you from a horrible experience. Just after our 2 year warranty was up, we have been billed over 1,000 ( all new set of batteries - a new computer board - even after we paid for their routine yearly check-up)...When they could not figure out the problem, they just keep charging/adding new parts, and when I question it they said "sometimes a new part will make a weak part go out"