Anyone Sold to Covina?

I'm considering selling some commemorative $5 gold, mint sets, and proof singles to Covina. Has anyone dealt with them? I have several questions if you have...
How quickly do they pay?
Any idea what makes a coin problem enough that they return it (spotted or hazed proofs for example)?
Did they stick to their listed prices or try to go lower?
How quickly do they pay?
Any idea what makes a coin problem enough that they return it (spotted or hazed proofs for example)?
Did they stick to their listed prices or try to go lower?
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Comments
DPOTD-3
'Emancipate yourselves from mental slavery'
CU #3245 B.N.A. #428
Don
They really like Morgans.
Payment has been described as a little slow. (That's conservative)
You really need to get a look at the woman behind the table at a show though. You won't mind waiting.
Got quoins?
DPOTD-3
'Emancipate yourselves from mental slavery'
CU #3245 B.N.A. #428
Don
David
If you send them coins, they take all the time in the world.
Got quoins?
MARK
Michael