Years ago my start with Lensbaby was a Muse kit with 50mm optic and drop-in magnetic aperture disks, which I shot on a K100D. Since acquiring a 35mm optic, and later a full frame body, I've been enjoying the wider angle of view those give together; and putting aside the more recent Composer Pro and rediscovering the Muse accordion, this has been my favorite rig lately: K-1ii, Muse, Sweet 35.
I do like the speed and spontaneity of the Muse. Not as precise as the Composer Pro, and gives a lower keeper rate, but focus peaking on live view helps some.
atlas moth