Living in higher elevation with harsh sun, cold winters, wind, snow and ice followed by more wind and snow. We have not seen the seams come apart. What we have seen is tears on the corners, even with the best foam protection the wind
just does a number on them.
I have elected the 2 year extended warranty from CW which I believe is 79.00 for 2 years. So it covers tear, rips, etc. So ever 1 year 11 months I take it back for a new one and pay another 79.00 for 2 more years. It is now like a $40.00 "rental" fee for the cover... LOL