I've had a mixed experience with a number of multi's, but I've also been pleasantly surprised with the softness I get from Gosen OG Sheep Micro. It seems to deliver more softness than other syn. guts I've sampled, yet without getting overly mushy in the way that many multi's seem to as they age.
I offered this just because I think that a softer syn. gut might be a decent alternative for a multi user who needs some extra durability. Haven't used it in a while, but I also recall finding a rather soft ride with Prince Original Syn. Gut (pre-Duraflex).