Technically they are a legitimate domain name registrar, HOWEVER, do not send a payment to this company unless you are 100%, without a doubt, sure that your domain name is registered with them.
This company (and some others like them) collect information on when your domain name expires and sends you an “advertisement” that looks like an invoice. Their fees are higher than average AND their goal is tricking people into switching. Not a company I’m interested in ever doing business with.
Below is a current example of one of their “advertisements” with the domain name blurred out for privacy reasons. Front, back and envelope. Click for a larger view.

