I've had my 2-liner for nearly 3 years now. The clasp and the caseback, both of which is made of s/s, definitely have their share of scratches as the Pelagos probably gets the most wear of all my watches, however the TI has remained relatively clean on the case with just a few minor scuffs on the bracelet.
One thing rarely pointed out about the Pelagos is that because the lume plots don't have a surround around them like modern Rolexes or its brother the Black Bay, I always feel they are more akin to vintage subs like a 5513 which is a look I strongly prefer. The 2-liner has the added advantage of symmetry at the date window with that "mini-marker" to balance out the 3 and 9 positions. Don't think I'll ever get rid of the Pelagos, although as a lefty I would happily trade for a LHD!