Just wanted to say that if you can afford a $200-600 phone, and a $1000+ camera, paying $8 to support an app developer isn't that much to ask.
That being said, I've found Wi-Fi on my 70D to be fiddly... I'll usually have to switch to a different set of connection settings on the 70d, then back to the set I'm trying to use, in order to get the camera to accept the connection. Not sure if it's the goofy permissions system on the camera possibly acting as a firewall, but I can oftentimes see the camera on the network (with a network scan), but am unable to connect to it using the app until I toggle to a different set then back.
Also keep in mind you'll need to use a different set of parameters on the camera when you use DSLRController as opposed to EOS Remote, since apparently the permissions system is bound to an app, not to a device. Since you can have 3 sets of settings on the camera (per connection mode) it's not too much hassle, just something to keep in mind.