I just ran mine with the no climb option, and while the nylon wheels did bump into the walls exactly as I described above, it did not do it with the same force as when it was trying to climb.

Tomorrow I am going to dive the pool and check the liner out again. The water is too cold today.

If I can get by with out damaging the liner, I will keep mine. It cleans great.

If not, I can sell it here in Massachusetts for a fair price, to someone with a Gunite or Fiberglass Pool.