I've ordered a set of these to try on the J-45 - basically they're the bass and treble strings from a 0.13 set and the middle ones from .012
I'm curious as to whether they'll be a good multi purpose set for both dropped and standard tunings - I found that full on .013's choked the top a bit in standard, whereas with DADGAD etc on the .012's the note attack sometimes went a bit sharp.
Funnily enough I've noticed the guitar itself seems to really respond to lowered tunings - in standard it can be quite mid-dominated, but in open D for instance it's girt hugeous right across the board.
Anyway, I'll try the True Mediums for both types of tuning and report in. I might also have a go on the 'Bluegrass' set (.012 set with .013 bass) at some point.
Does anyone know of any other makes where the .012 set is slightly higher tension? I've tried the standard Martin phosphor bronze but found they go dead really quickly.