Well, I'll try to answer OP as best as I can.
I know Seagull is working on improving their cameras, so the new ones will be better than what I have.
Film loading is about as easy as any other TLR. Open up the back by turning the dial, and load the film in the bottom. Mine has pull knobs which work just as well as the push bars on my rollei or the pull knobs on my yashica. The knobs on mine don't lock in place if the camera is closed, so I guess if you tugged one, it would drop half your film reel and be interesting to recover from, although I believe the yashica does the same. The seagull has a locking bar on the know that needs to be pushed to allow it to open. Never seen a TLR accidentally open, but it is a nice positive retention method that does show you that you have incaft closed the camera completely.
The self timer on mine eventually broke, but I prefer using a cable or air release. Even for a picture I am in, Either a cable release or a friend at the camera works fine for me, ad is how I use any camera really. I don't use self timers.
mine uses a knob to advance the film, with the red windows on the back. Simply turn until the number appears in the correct window and take a picture. The shutter on mine is cocked by an actual cocking lever on the front. I think newer ones use a winding lever instead of the window and cocking lever.
So I can double expose and other stuff as much as I want, which does allow me some extra freedom.
The lenses aren't the sharpest or the most contrasty. They are adequate for most needs, and are capable of far more than holgas. Not as good as a high quality lens, but they are functional mid-range lenses.
I actually like the viewfinder on mine. It has the split-line focuser with the matte ring around it, like you tend to see in 35mm cameras, so when I unlatch the magnifier (it has its own little latch, which is neat) I can get a really good focus with the magnifier and the split circle.
Unlike any other TLR I have used, using the sport finder does not pop up the magnifier, as that part hinges at the back instead of from the front, and has a cutout for the sport viewfinder.
My suggestion is if you can get one cheap enough, it can be a fine camera for basic use. Don't expect German or Japanese build quality. Seagull is working on improving, and some more professional reviewers have stated that the cameras are in fact, getting better.
Still, yashicas, rolleis, and that c220/c330 from (I want to say mamiya or minolta, but I'm sure neither of those is right) are all good cameras.
Actually, those c220/c330 have interchangeable lenses and other luxuries not seen on most TLRs, and have been highly recommended to me, I would suggest one if you can swing it.
Ultimately, it's your money and your choice. See if a rental place has some TLRs, or if a camera store has them. Try out some various ones and get the one that seems to fit you best. If the Seagull does it for you, get one. If a yashica floats your boat, get that instead. How's that for useful advice?
EDIT: Seagull actually seems to have a fairly large product range, including lenses, lights, and large format cameras.
http://www.camerachina.com/product.asp