I just got this. I had a specific space for it. It fits great. Takes up minimal space but is a good size for cooking large portions. 
Easy to use and set up. 
I would not advise sitting anything on top of oven. The entire exterior of oven becomes quite hot when in use.  Make sure you don't have anything that would melt close to the oven. 
Definitely run it on highest temp for 15 min with all the racks in place, as instructed in manual. It burns off some oils that you definitely don't want to cook your food with.