Fun vs. EZ
I was also considering a Fun or EZ. I got the Fun based purely on the hype. I mostly creek and wanted a river-runner for Gore and the miscellaneous III-IV runs. At first I was concerned I bought a full on playboat. I don't play, I can do flat-spins and squirt, and thats about all I can do or currently care to do. I thought the EZ would be a good choice if the mood ever struck me to pursue more play in the future.
Now just to let you know, the Craw is a good friend of mine. We've been paddling together for a couple years and have logged many miles. He is somehow associated with Jackson Kayaks. I would have bought an EZ if I didn't know him.
I only took the Fun down Union Chutes, the Poudre, and Deckers prior to yesterday. I was ready to post it for trade on the Buzz for an EZ when Craw told me to move forward a bit and try it again. I wanted a Gore boat so I decided to give it one final test on Gore (~875 cfs). During the paddle in, I was sure I would be posting it for trade today.
With the seat forward a bit, and a slightly more aggresive position (Gore will do that to you), the boat ruled. The meat of Gore Rapid (the Skipper) was so clean my face didn't even get wet. I did piton the rock in Tunnel but that was more pilot error than boat (I've always had a problem with Tunnel). Still a relatively clean line though. A couple squirts when I went for a high brace but overall stability in the gnar was superb. The Fun has a way of skipping over holes and staying on top of the water in the middle of rapids that I didn't expect from a boat so small.
I am keeping the Fun.
Conclusion, I don't think there is much doubt that the Fun will play better than the EZ, but I'll defer to someone who can actually play to talk about that. If you are concerned about the river-running abilities though, I'd say you will be pleasantly surprised. But, the Fun's stern has less rocker than the EZ and the deck is sharpen so it will squirt you if you aren't paddling with an aggresive forward lean when appropriate.
My only problem is with the footbag. I don't like to mess with it everytime I get out of the boat, I'm impatient. Occasionally it does feel super comfy, but it takes me too long to get the bag in the right possition and often have to get back out an re-set it. Personally I like a custom, home-made minicell footbed that doesn't need any maintenance every time you get in it. But try it yourself, some people love it.