I'm not a fan of them. The American company that sells them here is based less than an hour from my house, so I've visited them a couple times, and a lot of local restaurants have those ovens. I've yet to have even a decent pizza out of one. Granted, a lot of that is the people making and cooking the pizzas, but I think the oven doesn't help any.
Denmark is a bit closer to France than Italy - have you looked at Four Grand-Mere ovens from France? They are excellent, and they make a lot of both commercial and residential models.