myself, but several of my clients have done it on my recommendation. I haven't had a single complaint from them, and I know from experience that I would be the first to know if a problem arose.
I was looking at Advent machines in my local PC World branch(Staples corner)very recently, and I was impressed by the apparent value for money. The build quality looked non too bad either. If Advent machines were problem prone I assure you we would know about it here, in the forum, but we see relatively few threads.