Product review (4 stars): Seems OK but a *lot* of heat comes out the vent at the top rear of oven
I *think* I like it, but when it's on bake (not convection, just bake at 350F), the rear top vent lets out a LOT of heat. For an oven to be efficient it's supposed to keep most of the heat IN - this is like having a small space heater.  Does everyone have this issue?  Is it normal operation or a defect?  Please comment if you own one.