We just installed a Thermador MCES in our island. For us it was the only place to put it, and I wanted a smaller micro/convection oven to go with my cavernous range oven.
A few things to consider. In convection mode, the exterior (and I'm assuming you'll use a trim kit for addt'l ventilation), the exterior can get pretty hot if you are running it at 450. Probably not a wise idea if you have small children.If you do have children, and they are only using the microwave feature, having it closer to their size may be preferable to adult eye level, or counter-top applications.
After years of eye level microwaves, it does take some getting used to for the "bend and nuke" usage.
On the upside, having a smaller oven cavity is ideal for smaller items (I baked a couple of potatoes earlier in the week) and was glad I didn't need to fire up a 5.7 cu foot oven for the task.

Thank you! I will look at the Thermador and compare. Great point about running convection at high temps; it would be nice to have the smaller oven for quick things. Will keep researching!