The boat is stable, tracks well and has ample room for lots of stuff. The paddle holders are uber convenient, and the rod holders are a nice addition for those of us who fish. I thoroughly enjoy my time in this kayak, and while I have not faced truly big waves, she weathered 2-3 foot swells in Sound quite nicely.
If it's a solid open water boat you are looking for, the Quest 13 would serve you well. I am upgrading my son to a Quest 11 next year, that's how much I like mine.
The quality of this kayak is great, and the only issue I have had is that the back hatch is sometimes difficult to remove, but a light coat of Vaseline seems to have done the trick.
If you are looking for a single boat to handle multiple types of water, you would be well advised to check out the Remix. I got the 9' since I use this kayak for mostly moving water, but if you plan on carrying lots of gear, look at the 10'.