Microsol is just a little more aggressive... ok a lot more aggressive... it still takes awhile for the decal to sit down pretty and dry... (not too long about 20 min or so) I only use Microsol for decals on compound curves (goes several directions at once) and sometimes there are unruly decals that either because they are thick, or are expected to lay down over a large protuberance in the fuselage, don't want to sit... Microsol forces them into submission. If you think you want it, I think both www.squadron.com and www.greatmodels.com stock it.
If you get the microsol don't even think about touching the decal until dry... voice of experience
Most everything I have come across sits down with several applications of Microset.