I have a recessed undertrack pool cover from Pool Covers, Inc. and am very happy with it. However, it does seem that they can develop leaks early in their life, though they are under warranty (parts free for first 3 years, pro-rated after that to 7 years; labor free for 2 years). I don't live in a freezing climate, however, so can't comment on the winter cover aspect.
As for domes, we took a look at this link and decided it wasn't for us -- mostly because of how tall the dome is and would be visible by our neighbors. It does seem to be a reasonable (though not inexpensive) solution for those who live in more rural areas or with lots of tall trees obscuring visibility from the neighbors.
Richard
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