I am having issues with my Coinco bill acceptor (7-10 years old) on my WS2, that not all bills are being registered. Unitec told me its the way Coinco manufactures their wiring harness in which the pushin connections become loose and the WS2 doesn't register the bill. In addition to, even though it has been upgraded for new bills they don't always accept $5 bills. I am looking to upgrade my acceptor. Who makes the best and most reliable bill acceptor today and that will work on a WS2 looking to accept $1, $5, $10, & $20? Is Coinco still the best? I also heard Mars is good too. Can someone point me in the right direction? Thanks in advance!