I loved my Recteq app when I lived in Florida. Moved to Indiana and our internet is 5G. Recteq's app is not compatible with that. I have tried using an extender in my garage with 2.4G, but somehow still having an issue. So, I would say that app was totally fine, but compatibility has been a challenge.
As Lew says, the Recteq app doesn't try to take over your cook. It is just a straight up monitor for your grill. You can watch how things are doing and change temps settings. What else would you really want? I think that one of the SmokeFire's problems in launch was that they went overboard on the software with so many hand-holding options. Meanwhile, the basics seemed to give people some definite hassles and I am not sure are completely resolved even now.