Not sure if the people above are trolling or what, but I'll leave my honest experience with him.
I have been working with MowSam for a few months after I was badly scammed by another accounts seller here on BHW (worked with MowSam in the past with great experience too). The other seller had been taking funds from our spend balance very slowly over a long period of time (stealing). It is very, very difficult to find honest providers who understand the concept of long-term business in the accounts space. After 10 years of being an affiliate, I must say that MowSam is the fastest, most transparent, and most helpful seller I have ever found. No delays or stalling from him at all. He appreciates that you need to act quickly on something. The fees are higher than my previous providers but well worth it and I am more than happy to pay it in exchange for what we get.
As far as the quality of the accounts - they are amazing. We are able to launch at a 10x or higher budget than what we could in previous accounts without issue. Strongest accounts I've ever used. I have not had one single ban to date (although I am not running BH - not my thing).
I would very highly recommend working with MowSam, especially compared to some of the alternatives on this forum.