We didn't try the Apple interface, just CD playback using the remote. It wasn't only about the user interface,, the Studio is a wonderful sounding unit, but with my visual issues a number of very minor complexities which would be no problem at all to a sighted individual are more challenging for me, hence my reluctance to pursue going through with the purchase.
Funny you should mention Kalista, it was my first thought as well, however having discussed this with Richard at Lotus, he felt the Kalista sound ranges more to the silky warmer end of the spectrum, I wanted to keep things as neutral as possible, so I'm currently looking at a 2 box solution, Metronome Le Player 4 Cd transport and Thrax Maximinus 2S dac, both employ touch button controls to some degree, oh for the days before touch screens.