The 5-star is expensive, but I wouldn't call it overpriced.
I have had one for a few years. Still as good as the day I bought it. My wife has a similar pad (20x ?) and, while a nice pad, hasn't held its form as well. Nothing wrong with the other pad, but for the extra $30 or so I like the 5-star better.
I also have a thing about artificial materials - I don't like them on me and I don't like them on my horse. The 5-star pads are all felt, no rubber, no gel, no gimmicks.
One downside it that I found the back seam of the pad was rubbing both my horses when used on longer rides. The pad is joined by a sewn seam... when sitting on it the thread would rub on the horse's back. I called 5-star and they said this can happen on some horses. They offered to take back the pad and modify it at no cost to me.
I never got around to sending it in. Instead, I just ride with a saddle blanket under the pad. This solved the rubbing problem. It also keeps the pad clean (no more horse hair/sweat to clean off).
I am also a big fan of their mohair cinchas. Like the pads, these seem to last forever.