I really enjoyed the Ketron Midjay for a couple of years. There are some trade-offs in using a module--more wires to hook up, more pieces, etc., but you gain a lot too. Like very light weight and portability and the option to use any controller you like.
I even used a Casio WK a couple of times.
I wish the BK had a vocal input and harmonizer. Still, if it sounds like an E80, or even marginally better than my E50, I'm in.
DonM