Currently I have use of a small industrial building that has a 12' door. And heat when I need it for winter projects, which is nice consider it is 11ºF this morning! I store the RV in there, but length is not a problem. On our last trip, 3 weeks, we had a hitch carrier on the TL which made us over 25'. We just loved the way we could pull confidently into any parking lot, any downtown area, McDonalds, etc. We realized that while another two feet isn't that big a deal, at some point adding length takes away the ability to go anywhere. We did actually drive through the old part of St. Augustine, so it sounds like you know what I mean.
As to the product line, I have only been a casual looker at C's in the past. I do see that the FR SS line has 2" thick walls, and uses the Azdel non-wood product instead of luan wood in the wall construction. So in theory, it's better. Lighter, and not affected by moisture, so delamination should be less likely in the event of a leak.
They use gelcoat, not the cheaper basic grainy filon finish you see on some RVs.
Fiberglass front cap, which is optional but inexpensive, and essentially standard as far as what's on dealer lots; and anyone is crazy not to order it. It still involves flat overlapped joints in the cabover, and those are where water can eventually intrude. I intend to watch those joints like a hawk, and maybe lay a small bead of proflex caulk on them right from the get-go.
Integrated entry step, which I like; no external step. pnichols points out that it could affect ground clearance, but I don't think it will be an issue for me personally. He goes exploring with his MH.
Holding tanks are good sized, and are in the enclosed area, and receive heat by being there. Same for the dump valves.
Dual batteries
Electric & DSI WH
Firestone air bags to fine tune the ride (rear)
Generator transfer switch
Water filter
Electric awning (seems to be standard these days everywhere)
Slide awnings
fiberglass roof
5000 lb hitch, 7 pin connector
All the current electronic goodies including backup camera
The shower stall is pretty tight on the 2300. Some people don't care because they use CG showers. I wish it was roomier, and I'm not a big guy.
2nd coach battery
Nice cabinetry and hardware
Drawers for dinette base storage
Good Serta mattress (optional)
Fantastic Fan optional
Lots of storage
Except for the less than full-cabover-coverage front cap, I think it's all first rate stuff, and the prices are down in the typical entry level range. If you use RVDirect.com's price to get your dealer down. Quite a bit less than Winnebago, which to me is the standard to judge a Class C by. Maybe the lower end Minnie Winnie's are similar in price, but inside they do not look as high quality as the Sunseeker.
From reading the forestriverforums.com, I can see that the company, at least the Sunseeker division, is constantly listening to feedback, and using it to improve the product. I like that. I'm sure all companies do that, but FR seems better than I've seen.
That's a lot of writing to say I think they are well built and have good bang for the buck. (knocking on wood!)