Interesting demos. The loop feature has been present for years in Korg arrangers, like my PA2X-Pro, but compared with the Roland approach there are some differences. The BK-9 apparently streams the loop from an external source (like a pendrive), while in the PA they reside in memory (RAM), and this means that you have to load them beforehand. Advantage of the Roland approach: you don't need to load anything, but just assign each loop to a key in the upper octave of the keyboard. Advantage of the Korg approach: you are not limited to one loop at the time: since they are assigned to the multipads, you can play up to four of them together.
Of course the final result will depend on the kind of music you play and, consequently, on the kind of loops you choose. In these demos the loops are so complex that one of them is more than enough. On the other hand on my PA2X-Pro I use audio loops in a more "subtle" way; for example, in a latin style I can use percussions like congas, triangle, shakers, cabasa, guiro and so on, adding them during the song to create a rhythmic progression, and this approach works well also with ballads. Frankly, for the kind of music I play, I almost never use loops like those shown in these three videos, but if you are into disco, dance and so on they work fine. Anyway, choosing and creating a good loop is not easy and it's a little art in itself.
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.
or faking, 
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