You'll love it. H3 was the boat I used to step up to harder stuff and I still use it for big water. A few H3 peculiarities:
You'll need an extra large keyhole cockpit.
Don't step on the seat where it says "no step"
The bulkhead outfitting tends to get loose easily, particularly while on the roof. Locktite.
The H3 seemed very sensitive to seat position. Take some time to find the right position for you. I found I needed to be further back in the boat than I expected.
In my experience, the H3 has been more demanding to paddle and can be punishing if you're asleep at the wheel. Could be because I'm 200# and have a 245. For me, the H3 demands an aggressive posture and paddling style, which teaches good skills. When I'm getting getting tossed around, I think "lean forward, attack your line." When you're aggressive, as Ture said, the boat is very easy to correct.
I haven't found it particularly hard to roll, but now that I've said that...