I tried Lightroom Mobile but the app will says it is not compatible with my Android Dell Venue 8740 8" tablet so it is useless at this point. Wish I could restart my 30 day trial period if they ever fix this app in the future. I own the pay-once version of LR5. Also, it would be nice for Adobe to tell us what is and isn't compatible and further, it would be nice to be able to sign up somewhere that would then let me know when they fixed this.
Lightroom Mobile for Android is actually Lightroom Mobile for Android Phones at the moment - Adobe's pretty unambiguous about that.