References for self-directed Solo 401K providers?

[Brock Butler]

I already have an LLC and I want to set-up a Solo401K with check-book control. I will make investments through a brokerage account as well as non-traditional real estate investments.

The providers with the least expensive rates seem to be MySolo401K.net, Fox&Fox, and Sunwest Trust. Does anyone have any experience with these providers, and are there other low-cost providers I should consider?