Gulfstream Forum, where you're more likely to find owners:
https://www.gsowners.com/forums/My current trailer is a Gulfstream. Generally speaking, they're a low cost producer, but the actual fit is usually okay. If you're handy, they're a generally good choice. E.g. You're likely to need to tighten up the plumbing yourself, and other relatively minor things of that nature that are generally easy for someone that knows they need to do that, to do. The cabinet framing is pressboard, but well put together. My trailer arrived with a bad water pump. I replaced it myself with a variable speed, much quieter, one.
After my initial fixes of loosely assembled plumbing, replacing the water pump, and fixing the power cord holder, I've been happy with my trailer and it's served me and my family well.
How happy you are with a GS is likely to depend on how willing and able you are to fix relatively minor issues yourself after you get it.