We were so excited about this oven...And we do love the microwave.  We love the styling and easy open door - auto cook features are all great.  But, when we've tried to use it as a convection oven - it takes like 20 minutes to preheat to 350F which is forever.  Is this because we have the 120V version?  Also - never thought about it before - but if you have used it as a convection oven - you don't want to turn around and use it as a microwave because you can't touch anything - the door and insides are all 350F.  So - the combination thing is not as awesome as I thought it would be.  So - I do like my microwave but it is a very expensive built-in microwave.