Finally got it on the water, a week later than planned:
YouTube - Spitfire Kayak on Lost Lake (Nehalem)
Attaching it to the roofrack was a little difficult due to the width of the kayak. Really seems to take two people, one to hold it while the other is looping the tiedowns through the hook from the other side. Once one of the tiedowns is reasonably secure (not fully tight, but tight enough the kayak won't slip off), then one person can do the rest. Tieing down upside isn't really a possibility because the folding seat hangs down and will pound the car's roof.
Paddling it was easy. Doesn't track very well, turns on a dime, so you can do nice spins and still be going in a straight line if you're into doing tricks. If you want to go fast, you just have to accept the fact that the nose is going to wander a lot, but your average direction is right.
As a fishing platform, it's a little tight, but useable on a lake. On the 15 acre Lost Lake (Nehalem), it was only a few minutes paddling to reach the other side and return... about as fast as the rowed pontoons except you get to face where you're going.
Weight capacity is as advertised. I weigh about 215-220 lbs and was able to add the cooler to the back storage compartment without compromising my floating level.
Long term, the scupper holes under the seat are going to get plugs. Whenever I plopped into or jumped out of the seat, the scupper holes would squirt water into my rear... great if you want an enema, but not too pleasent when you don't! My friend, who is probably only 160 lbs, didn't have to suffer this indignity.