BIAB gives me an unbelievable larger palate of sounds making the purchase of a newer kb unnecessary. I find it interesting that Yamaha is bragging about its real drums that BIAB has not only had for years but gives you yhe ability to record and create your own. BIAB also provides over 2700 real tracks and the ability to create user real tracks with an active user base that is doing just that. Yes, it is not a real time arranger but it does provide exceptional back up tracks that work well with any keyboard. It takes no longer to create a backup track than it does to set up a registration or create a song style on the kb and in my opinion the final results are usually much better.