I also forgot to mention this:
My RESIN pool can support a 250 lb person sitting in the center of the top rail without any deflection (so I think it will actually hold 300+ lbs), I'd like to see that on the typical extruded aluminum channel, I've seen them bend under my weight which is a measly 180 lbs in comparison.
The bottom track on mine is resin as well, we have harsh winters here in Ontario, this winter was especially harsh with regards to freezing and cold because we got NO snow, so nothing was insulated from those harsh humid winds, my resin would probably have been at temperatures around -20 to -30 Fahrenheit many days, I think at some point this winter the entire pool was a block of ice which rarely happens, yet, miraculously there is absolutely no damage to teh pool, resin, walls etc.
But since the salesman told you it was cr@p, I better go get a new one....