I would not get one of these things (covers). I'll do it right and get
a contractor to replace my tub and do the rest myself. My guess is
that they look OK, but when problems arise, as they will eventually, it
siwwl be much harder to fix. I don't cover up problems, I fix them.
If I were looking at houses to buy and one had one of these, I would
figure in the cost to replace proper and bid appropriately.