A very good question.

I don't compose songs, don't want to get into Realband and just use BIAB to accompany my keyboard playing. Although I like the sound of RTs I don't use them as much as Midi for two reasons.

1) As Axey says it takes a lot of effort to audition and add RTs to a style.

2) The ready made RT only styles are a bit of a disappointment - not the sound but the arrangements. There are many more "interesting" MIDI styles. Also why do so many of the RT styles use up one of the instruments for a solo? If you mute the RT solo the rest of the RT style is often very ordinary. I would prefer creative RT styles that provide just a full band backup and I will add solo RTs to the melody and/or solo track if I want to.

Tony