I'm with Webreseller since 5 months and I find the support really great and friendly. They're very fast too. Unfortunately, the network is very bad since 2 or 3 months : donwtime again and again. I'm very sorry to say that because the team is nice.
But I'm quite nervous with all problems and my customers send emails to me to ask what happens with my site... I think I will leave next month if nothing goes better soon.