Dox, I'm going to take a slightly negative tone here even though everybody knows I'm a huge booster of Biab and PG Music. First, Miles Black is a killer pianist and I have all the jazz and blues piano master classes that he did and the dude can play. I strongly recommend you upgrade to 2010 because it will greatly expand what you can do. Having said that, as good as the Real Tracks are, they're still prerecorded phrases and sound somewhat generic and a little choppy because the sustain will get cut off by the program fitting different chords to your song. There are several different excellent piano styles right now and more are coming. Some of the midi rock and pop piano styles are very good too if you have a good piano sample.
If you have a good original tune, you probably are looking for good original parts to go with it and the RT's won't provide that but you won't know that for sure until you get them and try them out. You might hear something in the piano RT that sounds almost like something you want but you will think man, can't it be this way? If you're working with a real player, five minutes of playing around and he'll nail the part but the RT's can't change. There are some variations and Biab does a good job of showing those but still, you can't write exact RT parts. What was prerecorded is what you get.
Get the upgrade because there's nothing else available that can even come close to what Biab can do for a songwriter but like anything else, it's not perfect.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.