I've heard some minor complaints about their units but a lot of folks are happy with them. As I understand it the build is decent.
For a decent reactor with regulator, $150 is a steal, especially compared to retail.
edit:
The reactor alone is almost $400 retail, and a decent regulator is usually around $80. Even if it's a crap reactor (and it's better than those Coralife ones, I guarantee) it's still a hell of a deal. Hell, I'll take it if you don't
I love mine, works rather well and it cost around $550 complete with regulator and aluminum 5 lb CO2 tank. $150 in good condition is a steal!
I would recommend making sure you have a fine tuning needle valve for CO2.