Here are some videos showing the different styles:

https://www.youtube.com/watch?v=pnEjdWUPizQ

https://www.youtube.com/watch?v=FSaSZa7Myno

https://www.youtube.com/watch?v=ysrArBFbTqw

https://www.youtube.com/watch?v=KZDzB4uaFOA

From having tried the BK-7m and comparing it to the BK-5 and
BK-3 keyboards, it certainly is the best of the bunch. Hope it works out for you.