I and another paddler from the local club were the first people to take the CLC ST "prototype" out on the water 6/01. It didn't have a rudder. It was a slight breeze and flat water. It has a moderate amount of rocker, more flare and rocker than a NorthBay (it really isn't a double NorthBay, it's a different boat, I built and owned a NorthBay), I don't have a lot of experience in doubles so my impressions are compared to Necky Tofino, Amaruk, Nootka,WS Northstar/plastic, NorthWest.5, NorthWest2.
In intent it's similar to the CLC NorthBay regarding a usable low initial stability, that's about the only similarity. The northbay doesn't have much useful "secondary" in my opinion and it doesn't have much rocker. In the ST there is some actual secondary and bow volume but it's (stability) taken to it's limit given that two 190lb paddlers do not move as one 380lb paddler in a 22' kayak. In other words two adult paddlers leaning will require a brace, it's not that it's tippy,it's that if your buddy keeps leaning and doesn't contribute you'll be working against him. It actually turns more easily than you'd expect for it's length and follows a turn as a hard-chine hull should when leaned unlike the Chesapeakes,,but I wonder how useful that characteristic really is given 22' working AGAINST two paddlers. I mean it'll start turning on a lean but it's a bear to take out of a turn once the momentum of 22' and two paddlers starts swinging,,think of an Eclipse/Sea Lion. Managable for a single but I really wonder what it's like in waves. I'm under the impression that rudders and doubles go together,,they aren't just a tracking aid as it's not as likely to have people coordinated together all the time in all conditions,,and the physics simply make the turning effectiveness of blades much less than a rudder for a big boat and mass under way.

We only took it out for 20minutes. The cockpits are about 1 1/2" closer together than a Tofino with I think has the closest cockpits for a double. I thought it would be a problem but not that much for folks with 220cm paddles,,I'd still want a couple more inches apart but that's me wanting to experiment. I put a Feathercraft rudder on it 8/01
The next time it was taken out was 9/01 in a flat water race in an inlet off the Chesapeake. Lloyd Reeves in Atascadero built one about that time. 10/01 I paddled it in 8" waves and 15mph wind at St. Michaels over an L shaped course,,it needs a deeper rudder than the Feathercraft as the deck mounted installation is about 1 1/4" higher than the Feathercraft was designed for (sea lion rudder from 20yrs ago in off the stern fitting). Given the rocker and slightly high stern mount the rudder doesn't go very deep in the water and was evident on 8" waves.

Personally I think it would be nice to play with the design a bit more as it's pushing four panels in an area where experimentation is needed to optimize stability, efficiency and wave handling. I'm picky and feel it's about 75% "there" given the market it is designed for.
I'd put a sealine or similar rudder that is of sufficient depth relative to the low spot in the hull. From what I've heard from Brandon Nelson in his experience of Feathercraft rudders on doubles is that the blade is not strong enough. It sat in a trailer for a month before another model for the catalog was cut and built so it's the same design as two yrs ago. It never got any modification or testing in wind/waves by experienced paddlers before production or the design modified from that first model.
But for 22'x22" and a kit it's the only one.