Here are a few differences between the BK7m and the BK5..
First let me mention again,,the BK5 keybed is not toyish..it is shorter key lenght compared to the G70 (half inch)..and is about the same as the PSR and PA keybeds..it is like the Juno G keybeds..and Roland controllers...Not great, but far from toyish...Much better than the mini keys on the little Korg....
Here are important differences between the BK7m and BK5..
The BK5 reads all .kar and .mid lyrics on the internal screen..(the main reason I passed on the BK7m)..
The speakers on the BK5 are okay..12 watts a side and they do not break up at full volume...I have never heard on board speakers that I could use as monitors on stage with a PA system...Studio and home use the BK5 works great..
The difference some folks think they hear, could be the "master tools" settings, and default effects...
I am sure most folks do not know the drums are different between the two models....The BK7m are taken from the G70..The BK5 are from the E80...
The kits sound better on the BK5 because it has the 5 or 6 "new" series drum kits...(new pop, new rock new brush perc etc)..
The tones are from the E80 on both models...
Both models have the "make up tools"...but the BK7m has the "covers" for SMF and styles.....Don't know why they dropped the covers on the BK5..it is a quick realtime change tool.
The lastest update on the BK5 improved the mobility of the operating system on stage...This was on my wish list...it is easier to go to other folders and back to lyric page without extra steps..
The BK5 has a decent search feature for songs etc , where the BK7m will only search performances.....I can scan 32 gigs (my thumbdrive size)..completely in about six seconds and shows the entire list with the search word you looked for..Both SMF and wav/MP3 ...I can even use this when DJing....(I have about 50,000 songs on the thumb drive..).
The GW8 is not the same sound engine as the BK series....The GW8 is the Juno/Sonic Cell engine ( inferior to the BK engine)..