S,
I have an older version of that Dolphin, and I agree with PoolGate.. Neither robot will care what kind of plaster your pool has..
I recently move my five year old Dolphin Premier to a rent house and now use an S200.. It works perfectly.. It was half the price of the Premier and without all the bells and whistles that I never used anyway. Drop it in a couple of times and week and it does its thing.
Thanks,
Jim R.