"Anybody have experience with OTCBB trading at Schwab or Fidelity"
I prefer Schwab using Streetsmart Pro which is a direct connection program, not web based. They route orders mostly to UBSS which bought out Schwabs trading business. I have a local rep who can usually problem solve any issues I have. I like that a lot. Reminds me of the old days of customer service!
Fidelity routes orders for BB that I have seen through NITE, the same as Ameritrade. Generally similar executions although you would think Fidelity has a longer standing relationship with NITE> My guess is that like Vanguard, Fidelity does not want to associate themselves with stocks under $1.00, therefore they keep the commissions high.
If my order on a BB stock goes to someone other than UBSS when they are in the stock, I will usually cancel it and forget about the stock. It tells me something stinks and I run away. CEDA being the recent example.
Signatures are so yesterday!