On 3-26-12 I got a notice of renewal. I went and renewed my subscription thru Paypal, and Verticlescope made two $20 debits within minutes, instead of the one $20 I intended.
I sent them an email requesting a refund of the $20 and never got a reply. So I guess you can use Paypal if you don't mind them sucking out more than they are entitled to.
I've used the forum quite a bit so I don't mind forking over the $s (I would have made a donation anyway) but I changed my Paypal to drop the subscription. I may have a 2 year subscription now.... then again, I may just drop the premium membership next time if that is how they do business.