Re: How do the Lil humbuckers compare to the full sized models in tone and output?
I actually prefer the JB Jr over the JB. I liked what I perceived as a tighter, brighter sound. YMMV.
I too prefer the tone of the JB Jr. to the full sized thing. That combined with a Quarter Pound middle and a Lil' 59 neck make a killer pair for a rock Strat, if that is what you are looking for.
Screamin' Demon as mentioned earlier sounds probably the closest out of all the Lil' pickups. I've heard some people say the mini Pearly Gates is dead on, but I've never tried it.
Hot Rails aren't based off of anything, but I can understand people thinking that they are based off of Invaders. I'd say they are somewhere inbetween an Invader and a Distortion. To the best of my knowledge, the Cool Rails isn't based off of anything, but it sounds darn close to a Jazz, so I don't know 100% either way.
I haven't tried any of the Red Devils yet.
I'd say you are in good hands with any of the single sized humbucker offerings, they are of the same quality as the rest of SD's pickups. As others have said they are not better or worse, just different, and not by much.