If I were looking for my first teardrop I suspect I would add the T@G to the lineup. There are some things to consider when comparing the four (and I'm no expert here, and haven't had the time or inclination to double check any of this - this is only food for thought, not facts - do you own research). First, the Camp Inn 550 ultra is an 8 foot long cabin (plus an extra nine inches for the pass-thru box/forward cabinets). It is that way because the primary design limitation is the standard 8' by 4' sheet of plywood (that is also why the 560 is a raindrop design, and not a teardrop - it is a novel design that gets past the 8' length of a sheet of plywood). I'm pretty sure that the three others campers are longer than 8', since fiberglass panels can be cast in just about any size ,and none of them uses a cabin design where the cabin footwell is located under the galley. It is my recollection that Little Guy makes and markets the T@G and Silver Shadow, and my suspicion is that they produce the Vistabule (based mainly upon similarity of galley design, and the fact that there are similarities in the style of their website designs), though I haven't checked to see if they list it among the brands that they also market.
In the fiberglass campers you'll get a lot more extra interior space in the cabin. Some folks will equate volume with value, but in my personal opinion you just get a lot more space to heat or cool when the weather isn't ideal, and you go from having everything within arm's reach (as in the 550), to having scoot across the mattress to get at the cabinets in, say, the T@G.
It seems in both the SS and Vestibule there is a greater amount of volume in the galley. But part of that volume is like the kitchen cabinet bases that you have at home - the space that is so awkward to use (down on the floor, deep in the back), that after a time you only find stuff there that you never use: more space, but not more function or functionality.
All I know is that tof he SS and T@G owners that I find in the wild (I have yet to see a Vistabule in the wild), most are envious of the Camp Inn's galley design, quality of woodwork and finish, attention to small details (heavy duty marine grade hardware, the drink coasters built into the cabin's lower cabinet doors, the available screen doors and the tray for storing your wallet, key's etc are just a few such things). There is just something about being in a quality environment made of wood vs. a fiberglass trailer (even one with what appears to be a wood trimmed [Vestibule]). You will understand that better the first time you spend several days inside the cabin as a refuge from inclement weather.
The prices of these various campers are roughly comparable (though the others don't make it as easy to compare costs, and they may be a little cheaper - you'll need to figure that out for yourself). But if Little Guy made a wooden camper like the 550 they would be charging a LOT more money than Camp Inn does, simply because they have to account for adequate dealer margins. By selling direct to their customers, Camp Inn delivers a great, custom built wooden camper for close to the same price of fiberglass campers that can be produced in a fraction of the time (and thus cost a lot less to produce).
In doing your research, try to find these various campers in the wild, and ask the owners of the fiberglass campers if they've seen a fully equipped Camp Inn and what their reaction was. I've seen more than a few such folks with a look of buyer's remorse after seeing our camper, even after the four years of very heavy use that we have put on it.
