reviewing legal issues on servicenode app for escrow.
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There are escrow specific laws, but they seem to be relatively ok
http://www.dbo.ca.gov/Licensees/Escrow_Law/About.asp
Using servicenodes and multi-sig should be a very good way to provide this service. The buyer and seller are party to the multi-sig so they never actually lose control of the funds. That makes servicenode escrow very secure and low risk for the operators of the servicenodes.
They are just a keyholder to prevent one of the parties taking full control. The servicenodes never actually get control of the funds themselves.