Does anyone use a Checkbook IRA LLC?

[Alfred Bell]

I currently utilize a self-directed IRA. My IRA monies have been invested in a real estate project. I'm coming out of that investment soon and I now want to use those IRA monies for buying at trustee sales. This "Checkbook IRA LLC" seems like it could be the ideal vehicle for this. I'm not familiar with their workability, validity with IRS, etc.

Does anyone use or know about these? Thanks in advance.