Temperature Control Products for Big Green Egg(Guru, FlameBoss, CyberQ)

Armin, the DigiQ DX2 doesn't have the wifi capability you're looking for.  I'm using mine in a 22.5" WSM, not a BGE.  It works great, but the right charcoal makes a huge difference.  

     1. With KBB, I found that it will occasionally chase temps because the charcoal burns out so quickly and unevenly compared to denser charcoals.  When it is chasing temp it can overstoke the fire, but the temp eventually comes back down. 

     2.  I've only used lump for higher temp smokes, in excess of 300F.  It keeps a nice steady temp until the lump nears the end of its life.  

     3.  With Royal Oak Ridge Briquettes, a much more dense and stable charcoal, I use the Guru as a minimum temp stoker.  I've had 2 to 7 hour smokes recently where the Guru never comes on because the chamber temp is so rock solid due to the charcoal.  The temp range of the smokes was anywhere from 165F (beef jerky) to 350F (whole chickens).  If the temp drops at all, the Guru stops it and no over-stoking.    

Personally I'd go with the CyberQ Cloud only because I've had solid performance from the DigiQ DX2, but I think you'd be happy with either the Flame Boss or the CyberQ Cloud. 

This unit looks interesting.  It's not a blower; rather it controls the exhaust vent of Kamado type cookers.

http://www.smobot.com/