I've posted on a couple threads here -- and over on the Kamado forum -- about my CyberQ. I love it! As Stefan says above, it works as advertised. No complaints about the temp control -- and the wifi took me a couple minutes to figure out. Ad hoc connection is fine -- but the real strength (IMHO) is the infrastructure mode which lets it function nicely as a web server in my LAN (I recommend *NOT* forwarding a port to it via your router since this current firmware has no password to prevent unauthorized access to the CyberQ -- next firmware, I understand, will add the password).
I run the CyberQ on an Chargriller Akorn about 100-125 feet from my router -- and I have no problems with connection strength. I'm currently using an early version windows app to log the time and temp -- saves in database, exports to Excel, and has a nice graphic interface showing the pit and food temps. It's a great way to keep tabs on the cook from my house -- plus I can access the CyberQ's web interface directly on my iPad and iPhone.
Great device. Highly recommended. I look forward to more mobile apps for it -- especially on the iPhone.