I bought one like this from Gearbox.com when it was on sale there for $0.69.
I received today and I must say that I am pleasantly surprised by how seamlessly it works with LG G2 and Hello Klick app released by Xioami.
There are few actions that you can assign using combination single/double/triple press and long presses.
I am not sure what functionality Pressy adds but I wouldn't have justified paying $29.99 that costs close to $0.69 including shipping from Hong Kong.
Pressy is probably charging for IP but selling for more than 10,000% margin is kinda expensive.
Hope you guys find what you are looking for.