I've read thread after thread of people who can't get them to run reliably, or they leak, plus they're really rare here so no one is going to know what to do with it if you have trouble on the road and can't fix yourself. Very few people who spend this kind of money on some convenience are actually going to maintain it, they're just going to expect it to work great because they paid a lot (read Sprinters, which I also love but wouldn't take one more than 100 miles from a service center).
On the other hand there are 30-40 year old propane furnaces and hot water heaters working fine in thousands of cheap campers (Dometic/Atwood). These are probably the most reliable things in these campers. I'm no fan of Chinese knockoffs and generally speaking I love the quality and design of European and higher end components but I have just never heard anything good about these, especially for the price.
I have also read of constant trouble out of Espar/Webasto type diesel heaters but I use one almost every day trouble free, well at least 8 mos. of the year, and a Russian made Planar I had in the Transit in my avatar worked amazingly well too.