I used a new Epic V6 Tourer. I choose it because it's built for efficiency and self bails like a sit-on-top kayak. The boat was smooth and efficient and the rudder was excellent. Of course, there are some trade-offs. There is not enough back support for touring. I'm 150 lbs and pretty strong. I have no idea how anyone is expected to paddle in these for many hours. I used my life jacket for back support, which worked but raised my center of gravity and made the boat more tippy. If there was waves, I needed to be fully down in the cockpit anyway, so it all worked out. Not sure what I would have done if we had full days of big wind and waves. I also used a carbon fiber wing'd paddle, which is really nice, except it can drip a lot of water into the boat. I fixed that by making sweep-ish paddles and increasing the paddling frequency. Not very efficient by I didn't want to go faster than the other folks I was with anyway. They rented 17.5 ft boats that worked well, except for worrying about flipping in high waves...I don't see how someone rolls with 100 lbs of gear anyway.
One comment on the self bailing: I had a hard time getting it to bail crossing Oyster Bay. We had 20 kn headwinds with breaking waves. I couldn't paddle the boat fast enough for the water to flush out. So I kept the valve closed and bailed water every once in a while. This worked fine and I still like the design (it value worked fine in other conditions).
She was fast and tracked as straight as an arrow, the skeg type rudder with its top of the foot peddle adjustment was ingenious. She was effortless to paddle even straight into a 15 knot breeze and chop. The light weight was amazing while other fellow SOT paddlers struggled to haul their boats on and off their cars, the V6 was a one arm carry and with ease to mount on the roof.
The only complaint I have was the minimal space I had to store anything, etc. Water bottle, chart or binoculars. I think Epic would do very well if they designed a true SOT, say 26 inches wide, staying with performance but adding a little stability. The kayak would appeal to many SOT enthusiasts, breaking there backs lugging 70 lbs and better.
On the water the boat is easily edged, while having reassuringly solid secondary stability - you can get the side of the bucket under water before the boat shows any sign of going over.
The boat feels very easily driven, not sure of actual speeds but my girlfriend now outpaces most of the standard 16' sea kayaks even though her paddle fitness is a bit lacking...
With the rudder down the boat tracks really well. I'm not sure whether it's due to the construction of the rudder system on the Epics (with articulating hull section), but the rudder is fairly stiff. For touring this is perhaps better as the boat doesn't twitch around when driving with the feet as skis with more sensitive rudders can.
Rudder up and the boat becomes incredibly manouvreable, does take concentration to keep it running straight.
Hatches appear to be watertight and the 'cam' closing mechanism seems very solid. The hatches do have to be located just right for all the cams to close.
Weight is approx 16-17kg with nomex core in the hull. Makes it a lovely light boat but whether you'd want to go rockhopping in big conditions is perhaps a bit questionable!
Only real bugbear (hence the 9) with the boat is the setup and location of the rudder uphaul line and cleat. It's just behind the left hip which isn't a very ergonomic position to pull from. The cleat is also recessed in such a way that the rudder line does not re-cleat automatically - the line needs to be pushed down into the cleat for the teeth to bite. This turns the rudder raising into a two-handed operation - which could be a bit of a pain if facing a bumpy landing and wanting to keep one hand in control of the paddle at all times.
In conclusion this is a great boat if you are looking for a fast, capable ski/sit-on style boat. Stable enough for a beginner to paddle on flat water but with handling to reward the experienced paddler.