Overall, the ovens work ok. Food tends to burn quickly, even at the proper temp.  And, it takes quite some time to preheat. Unfortunately, I haven't seen a quick preheat option on these ovens.  Also, the clock will not stay set to the correct time. I have turned off the sync option in the app, but the clock automatically changes every day, often twice or more in a day, if I'm home to change it.  And the sync function turns itself on in the app.  The time on my cell phone is correct, so it is unclear why the clock continues to change to the incorrect time.