It seems that this thread has gotten "a little off track". It seemed to stop being about guitar synths long ago and turned into a RealTracks discussion - which happens often. So I thought I'd throw in my 2 cents along those lines....

I like what Mario just said. BIAB provides as much (or more) variation in its thousands of available tracks as you will typically find from the best studio musicians. The one advantage that you get from "the studio musician" is that they are playing specifically for your song (the current project). But they are, after all, calling on their experience - for that particular song. So they can come up with something "unique" for the current sound/melody. But, keep in mind, that a studio session happens fast. A work tape gets played, the musicians write charts as they listen (one time - they are that good). They may discuss a chord here and there - and then they go. They are playing the same riffs that they always do. And they are great, perfect for the "song at hand". But we have the opportunity to do the same thing with BIAB. And we can take the time to re-generate over and over - and the variations are PHENOMENAL. In the comfort of your own home.

When those studio musicians are finished (in one or two takes) laying your tracks - and that singer comes in to sing your song - and the engineer spends time mixing that track - when you are handed that final "tape" (a CD) - you are writing a check to the studio for about the same price that BIAB costs, ONE TIME - and is available for the next 3,000 songs that you want to produce.

No brainer.