Thier site is constantly down (usually a 500 error). And the front page hangs all the time for me too, where the only thing I can do is force close my browser (IE). It wants to hang Firefox on occasion, but it hasn’t completely done it yet.
I keep http://www.referspot.com/default.asp bookmarked to avoid their front page. I fired off an email to their tech address a couple of weeks ago but never heard back from them.