I've seen non yet to pay something with button here, when I was in need I used my coins to buy me what I wanted but already converted to fiat. No transactions directly made through bitcoin I ever have.
It is better not to convert the bitcoin to fiat before buying. If you use the bitcoin directly, that will help circulation.
If you going to ask me, of course i would like to pay with bitcoin if this payment sytem is available so i cant waste time by coverting it. But since it was not present i had no choice but to convert it.