I think most of the "steeler's seats" are fixed height. Probably the height that works best for playing pedal steel (although even those guys might want adjustability due to varying person-heights?!) Anyway, I tested out my steel-playing friend's seat, and it was perfect for me. At that time, I played bass pedals, and it was perfect height for me to play those (a bit higher than just playing keys). I bought my pac a seat (can't remember which maker I bought mine from) almost 20 years ago, and it has help up fine for that long, gig after gig. Mine has the original upholstery, original hardware, never a problem. I do tighten up the screws on the "piano hinge" part, every couple of years.

It can be somewhat heavy when you load it up with stuff; depends what you put in it. Mine has a mic, lots of cables, spare cables and adapters, power cords, MIDI cables, USB cables, stuff like that ... it has 4 compartments, so I can "organize" stuff a bit, too ...

-Jim