Are you talking about Magic [0]? I've used it a few times for rather esoteric items and had great experiences.
(Both were booking appointments at government agencies with awful reservation systems that often were overbooked or limited availability — TSA global entry appointments and DMV appointments. It cost about $30 each time.)
Ahh, magic: the guys that stiffed me on $1,500 and then flew the entire company to the Philippines. Been dodging me for two years. They're still around and scheming, huh? Still operating out of the cardio room of that gym, I wonder?
(Both were booking appointments at government agencies with awful reservation systems that often were overbooked or limited availability — TSA global entry appointments and DMV appointments. It cost about $30 each time.)
[0] http://getmagic.com