I was actually about to start a thread on this.
I have an Android tablet, and I never started using it for sheet music because I prefer having a real sheet.
However, I like the iPad app that can play the sheet music because I'm not an incredible note reader, and this would be a help.
Moreover, I am intrigued by the Yamaha app for the iPad that you can use to edit voices and styles, and they also have apps for the Music Finder database and for instruction.
For this reason, I just purchased a refurbished iPad 3 from Yamaha's store and a used Yamaha iMX1 MIDI interface
http://www.americanmusical.com/Item--i-Y...CFeZDMgod-EUAIQ that I found on Amazon.
I will be selling my Android tablet immediately. I am turned off by how expensive Apple products are, but I won't switch back to the Android until they have more apps including the ability to interface with my PSR-S950.