I have worked with Hung for the past three years and only seen/heard good things. Speaking from the datacenter where he has space, I would recommend you put in writing a breif paragraph to the effect that if you pay in full you will get your equipment back... or something to that effect if it doesn't already exist. Candidly, I think he is very trustworthy and is also excellent on the service and follow up end... we use him for various things and I'd be happy to share our experiences with his thoroughness. Hit me up on my email email@example.com
if you want to discuss in more detail.