Just be very careful with online pricing and sales. Call to ensure that the product you might get online comes from a "brick & mortar" shop that is authorized to sell Dolphin cleaners. Maytronics is very explicit about their warranty - they will not honor their warranty on third party internet sales. So, if you find the unit on Amazon or eBay or some such site and its hundreds of dollars less, the person or business selling it may not be an authorized Dolphin dealer. If you do find it online, you can always call Dolphin/Maytronics to find out if it is legitimate.
No, 1 year plus my credit card should add a year. I figure that if I can get it for under $900 the savings would pay for a repair.
I can always use my Polaris for leaf duty. It has a pretty big basket. Shame I can't run 2 bots at once.
The split roller allowing 90 degree turns is nice. I am 90% sold on the M500 except for the cord tangling posts and the post regarding breakage of the cord swivel on the M500. My Polaris never tangles.