I purchased some tubes for my phono stage from Viva. Since they don't have a low noise testing option like, for example, TubeDepot, I specified that I needed a low noise pair when I placed the order. When the tubes arrived I found them too noisy for phono section use. I emailed them and never received a response. Won't be using them again.
I've ordered many tubes from TubeDepot and only recall one issue. They responded immediately and resolved the issue at no cost to me. For NOS, my experiences with Brent Jesse have been similarly been positive.