At this point, I really don't see an android tablet making much sense for someone in this business. I have a Galaxy S3 and S4 (personal and work phones), I rarely use any audio related apps on those because there are so few.
I also own an ipad, and despite having a lot of actually useful apps, it's rare that I pull that out during a gig, either. Maybe if I'm in a pinch and need to control the board while I run to stage for a moment and can't find my A2. That's about it. More useful in corporate, I think, when you're less likely to have a dedicated A2 or decide to walk around to stretch your legs. Honestly, I use the ipad far more while traveling than on any actual gig.
With all that being said, I do think I will be purchasing a Windows 8 tablet. Not an RT, but one with the full operating system. I don't need to be running array calc/prediction software, but it will be nice to be able to walk around and control Lake/LA network manager/Galileo/System Architect, ect ect. I have a 15" HP laptop which was my workhorse for a long time, and now my 13" MBP has replaced that, but even a computer that small, I don't want to be walking around a venue trying to use it one-handed.