Since I don't play a lot with blues musicians, as far as keys I can play in without a capo, I find gaining F and Bb, and losing E and A, to be quite an acceptable trade off.

I find the Shubb mini-capo is lots of fun on the Apollonio. Gives you actual DADGAD instead of EBEABE as on a guitar in standard tuning. Takes some time to figure out what DADGAD chords and what standard tuning ones work....

P.