I havent made the leap to a robot yet. With a vinyl pool i was looking to at least replace the cheap vac head i have with one that has wheels. I had ordered this one Amazon.com : Ocean Blue Flexible Swimming Pool Vacuum Head with Chrome Handle Garden
and when it came in i realized it says "for concrete pools" on it? Doesnt appear to have sharp edges, i just want to be sure it wont suck the liner off the pool. It has plastic wheels.