It's a very nice watercraft. It was a brand new 2006 (never on the water) and I bought it in the end of summer 2009 (the dealer gave me a crazy deal on it).
It is very fast and extremly light and a fun to ride turbo charged jet ski. I put 4 stars for comfort becouse it is not the priority that an F12-X was made for.
If you are looking for a watercraft cruiser, buy a Yamaha Waverunner. If you looking for speed and something extremly nice to handle - this is the one!
Upgrades/Accessories: None (don't need to...at least for first three seasons).
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