No. I only attempted an order with BTC to see if credit would show up after they told me the credit was on my account. The credit did not show anywhere to be used and I let order expire. Their support then said you have to pay full price with PayPal and then they will manually apply the credit through PayPal.

Based on what their support has been stating, yes, you would pay full 1600 USD via PayPal and then they'd give you 1400 USD back via PayPal. I probably wouldn't attempt that though unless you don't care about potentially getting stiffed on your credit. They were also offering BTC refunds, but stated that could only be requested on orders that have already shipped.