Real close to the b3
If you play an A 100 or B3 and are tired of lugging it around I would suggest picking this one up. I bought a XK3c Pro system when they came out and I liked them for their portability but I thought that it lacked a little punch when you pulled all the draw bars out. But I found this new Hammond XK5 heritage doesn't have that problem. I have an A 100 as well as a B3. And find it very very hard to tell the difference in them. In fact it's almost impossible to tell the difference if them. I'll go so far as to say you can't tell the deference between them. I have been playing hammond organs for over 50 years. If you own the XK3c pro system you can use the bottom with the XK5 top. But you there are a few premature that you can't use with this setup like the multi contact function on the bottom manual only. The top still functions with either or bottom manual.