Sometimes playing something entirely new helps to improve skills just by learning new technology etc.
I've thought of buying a Korg, just to learn the different technology.
This is a bit of a Segway...but.
I just bought an iPad Air tablet. I've been an Android guy for years...sold Android phones/tablets and Apple as well. I have an Android smartphone.
I wanted to learn the OS of Apple just to have a new challenge. If I don't like the iPad, I'll sell it and I believe somewhere along the line, I'll learn a few new tricks that might work on my Android phone.
Also, I substitute teach quite a bit and education is the world of Apple as business is the world of Windows and Android. Understanding Apple OS will help me in my teaching.
So, I'm hoping to learn both worlds.
What the heck, I might even buy a PA900 as well. Why not? I have several different types stringed instruments. Learning to play mandolin actually helped me to play the guitar a bit better.