The BK-7m appears to be across between the Roland Prelude and a E-50/60..of course without the keys..

What I found to interest me, if what I read is accurate..

First the realtime sounds are set up as the E series..2 right hand tones and a lefthand tone besides a manual bass tone..a advantage over the Prelude and GW-7..

The specs also state that the songs are not limited to 999 total , but 999 for each list (playlist?)...and unlimited to the point of the capacity of the USB drive..The Prelude and GW-7 are limited to 999 total files on a USB device..

This next part is not very clear but appears that the BK-7m will read lyrics from SMF files stored on the USB device..a big plus over the Prelude needing storage of the internal ram to read lyrics (max of 200 files)..and non exsisting on the GW-8..

And a big plus for me ..the BK-7m extracts the chords from the SMF...like the E series and G series..

The last two items are reason enough for me to purchase a BK-7m..

There is another major improvement stated on the spec sheet..The BK-7m will transpose, not only SMF.s, but also the audio files..as well as a separate tempo change control..This is a biggie for me also..

I am more than willing to buy this unit sight unseen, as I did with the Prelude.
I am confident it will be a great asset..especially if I understand the specs correctly....:)

My intention, would be to use the BK-7m with the Roland A-33 controller (76 keys, that I miss with the Prelude)..and the Roland BA330 for mic inputs and monitoring...Perfect for my small gigs and my "Band" use....

It would also be a great asset to use with my still favorite Roland G70...

Look close at the specs and don't rule out the Roland BK-7m..too quickly...:)