Depending on your location in CT, you have a buyer on the forum that is within 3 hrs from you.
I would rather go with something that i know rather than something that will be a complete unknown, and if you are talking 3k lbs, I know i wouldnt want to risk that much.

Correct me if i am wrong but the way i looked at their site, they charge $350 to process regardless of ammount pluss $1.25 per pound treatment fee, then you get 98% of the gold and silver and 97% of the platinum and palladium.
So if my math is correct you will send them $4100 pluss 3K lbs of boards and hope and pray that they are good refiners and you get at least 2.4oz gold back just to cover what you have to pay them then if you only have mother boards figure $3 lb, you would need to recover another 5.3oz of gold to cover what one of the buyers here would pay you for your boards. I doesnt look like the give you anything back on the copper they process out of what you send them.
If I am wrong let me know, but I wouldnt do it.