I ordered my trailer with the convection/microwave combination rather than the oven. (It really is a thermal convection/microwave, but we won't quibble.) You can find a number of comments on this arrangement here on the Forums. Think it's a very personal preference. Some people love the often as you don't need 110V. Others never use their oven. After a year with this setup, I am more than satisfied. It works great in either mode...and does an amazing job with a steak (when I'm not doing it outside on the grill, that is). Also, does a fantastic job with brownies, etc. In terms of heat, I haven't noticed any issue with it.
"SilverLeaf II" 2015 30' Classic
2014 RAM 2500 Laramie 4x4 CC w/6.7L Cummins
WBCCI # 3430-Unit 21