So, I've tested it out a little bit.
The system stats are useful, and the Sound Control isn't bad either. Above that, I don't really see much utility.
The only games I have that have custom grids on their website are Skyrim and Civ V. For Skyrim, I played for about an hour without using the app once. With Civ V, it did alright, but after about ten minutes, my phone reset, then after a few more minutes, the connection dropped, and I went back to mouse only.
The VLC remote works well, and I can see it being used as a remote for an HTPC. Well, except for the fact that there are only basic controls, meaning that you need a mouse to select the file or disc, and, in the case of a DVD, select play.
Some people have asked about how to get it. It's free on the Google Play store, and you can get the Windows app from their website, also free. You need both for it to work.
Overall, it's an interesting thing to play with, but I don't really see myself using it much in the future.