If you are looking at used campers, don't limit yourself to one brand or model.
In my case I did not set out looking specifically for a Palomino B1500. I looked at several campers and this one was by far in the best shape and the price was too good to pass up.
With used campers the overall condition is more important than the company's reputation or whether the company is still in business or anything else. There's no warranty on a used camper anyway, and nothing is so specific that it can't be fixed by you or at worst a competent RV service center.
On my B1500, I like it for what it is. It's still in excellent shape because it was kept inside before I bought it, and has been kept inside since. The shower pan was a problem, but I found a creative solution.
I've had it 5 years now, and just last summer I finally added a few creature comforts including a rooftop air conditioner, 15" flatscreen, and a memory foam mattress on the dinette bed.