I happen to like them very much. Especially the ones aiming at the "running on empty" sounds. The Lindley slide sound is great.
But regarding Mark's profiles: I wonder if his tech profiled Mark's JTM45 with the cab (still loaded with EV's?). That would be the one to have for me. That's the Brothers in arms sound everybody wants. Or do they really use MBritts Marshalls for that sound? That would be interesting to know.
Matter of fact I recently wanted that Brothers in arms sound on one of my tracks and I did use one of MBritts Marshalls (a profile with the Greenback G25M speakers) and with the Neck-PU of my R8 I came pretty close (minus the fingers of Mark of course). Would be funny if the master himself uses MBritts for that song.