Minerskinz does quality work for a reasonable price-range. Miner and his team is willing to work with you and are professional about it. No matter what, you're going to get a custom design that matches the content and theme of your site within the time-frame that he states and communication is relatively smooth, so I wouldn't hesitate to pull the trigger if that's what you're looking for.
With that said, I would advise all future clients to know exactly what you want out of a custom theme so that Miner and his team can better provide you with a satisfactory service if you decide to choose him as your designer. Be decisive during the mock-up phase and don't be afraid to express your dissatisfaction. With Minerskinz, there is somewhat of blind leap of faith in that you're agreeing to pay the full invoice in advance before being given a mock-up of the design. Much of the customized graphics are just stock/default vBulletin buttons, icons and layouts recolored. A lot of the elements will resemble the native vBulletin forum/CMS. They also won't provide you with the PSD files unless you specifically request them.
If I'm not mistaken, the team is composed of Miner as the artist and coders. They take on multiple clients at a time so keep that in mind - be appreciative that they are able handle so many requests, even though it may take some time without any updates on the progress after the initial bulk of the work has been done. The big plus about the $1k package is that you get unlimited design updates.
I personally wish I'd spent more time in the mock-up and coding phases before jumping the gun because I was being too impatient and unselfish, not fully understanding what my boundaries as a client were, as far as wanting something incredible, even if it was going to take more time or that I was going to be coming off as too stubborn/entitled/unappreciative. Be passionate about the process, is all I can say. In the end, the final product is really good for the price compared to other designers in the market.