After 4.5 hours of play with Mantis Comfort Synthetic the outer coating has worn off and the string is hanging on by a thread. Just one more well-placed hit, and it's gone. I put the MCS racquet back in my bag and finished my session with Klip Legend, which had 22+ hours on it and 2 months sitting in the closet.
My overall assessment of MCS is still the same. It's a great string for groundstrokes, but I don't care for the soft feeling at the net, and it could use a bit more power for serves and putaways. There was significant string movement after the initial break in period, too.
I just had my grip replaced with Wilson Shock Shield. The combination of MCS, Shock Shield grip, and a Pro Kennex Kinetic frame is like butter. You would need extremely bad form to get tennis elbow with this combination! Too bad the MCS doesn't last long.
Picking up the Klip Legend strung racquet reinforced my thinking that natural gut is the way for me to go. No multifilament I tried can come close to lasting this long and still playing like a fresh set. However, I still need a backup when the weather dictates, and I have plenty of sets of multifilament lying around that I intended to test and/or play, so those will be my backups.