I used the elixir polyweb's exclusively with my 600. loved them.
Replaced my cleartones with Elixir Polywebs today.
Sounds absolutely great.
Been playing all day and absolutely 0% signs of rust or anything like that so far even on the plain strings.
I can agree on how some people say it's a bit warmer than a new set of uncoated strings, but it's very very very subtle.
While the cleartones sounded bright still, it sounded dead at the same time compared to when I first got it. The harmonic richness of new stings was gone from the Cleartones about 2-3 days after I got it. It was usable but definitely not new sounding.
In the end, Cleartones has something going, but is incredibly disappointing especially for people who NEED coated strings if they have acidic sweaty hands and don't want to have a dead tone after 3 days to a week.
Usable, but the coating comes off instantly and rusts fast.