I just bought a Remix XP10 a few weeks ago, my first kayak. I've been paddling a solo canoe for the past 11 years on mild rivers (Class I/II & very light Class III), so I was a little worried about crossing over to the dark side. So far I'm really liking the XP10, even though I haven't really paddled it on anything over Class I/II to date. The boat is definitely super stable and easy for me to handle.
With the skeg down it tracks well on flat water, it does push water more than a touring/ocean style boat, so it won't be near as efficient. We paddled 16 miles on a Class I river last weekend, the last six miles being completely flat with a strong wind blowing up river....just dropped the skeg and let it rip
I haven't learned to roll yet, but I'll be there soon enough. I plan on sticking with Class III and under river running, so it should do fine for me. With the skeg up the boat spins easy. I'm on the line as far as recommended size, so I'm sure I would have been fine with the XP9, but the 10 works well for me so far so no worries.
I got to try out my new 210cm Werner Stikine paddle last weekend and the length worked well with the width of the boat.
The only issue I see is that the skeg lever allows some water to drip into the cockpit, but I fixed that last night with the addition of two small rubber O-rings, let water set in the lever recess overnight and doesn't leak at all now.....$0.10 fix.