I have both Android and iOS versions, and they are great and get used about equally.
But a desktop version would make it a perfect trio. I find the larger screen and mouse control to be easier.
Plus, I have more storage on my desktop (10,000+ songs already) and I find myself constantly shuffling files back and forth to my overcrowded iPad.
Oh, and while I'm at it, and "audition" feature would be helpful to create tones offline and away from the rest of my gear.
Just process a clean stock riff (multiple styles?) through the signal chain and viola!
Most fun I've had in years!
Thanks.