Some cons: 1.To choose the time you have a minutes and seconds button. So to enter a time of say 26 mins. you have to press the 10 min. button twice and the 1 min. button 6 times. More cumbersome than a straight 10 digit keypad. 2.If you want to use the convection oven, it forces you to preheat it to the desired temperature for some time and then pauses with beeping sound. This continues until you open the door and set the final timer. So if you wanna heat up a puff for example with convection to retain the firmness, you'll need to first set the temp. on convection, wait for the preheat to finish, open the door, set the timer to say 5 mins. and then proceed. Again, a little cumbersome. 3.The convection itself seems to heat only from one side which is an uneven way of heating up or cooking stuff.