If you want a fullsize oven, then we keep reading great things about the Bluestar ovens. Miele also seem to have a lot of enthusiastic fans. Other brands are problematic, as they often have issues with the enamel flaking off after a couple of years -- frequently just when the warranty expires. This is a health issue, as you'll end up with sharp shards of glass in your food. Wolf was the first brand to get known for this problem, but these days, many other brands suffer from the same problem.

If you are OK with smaller ovens, then I can't say enough good things about the Miele combination steam oven (CSO). It's a game changer. Such an amazingly useful addition to my kitchen.