Those look like they are the same as the OBX headers. I have quite a few friends that have had good luck with OBX on other cars. Most of the time someone says they are crap is because they want to make themselves feel better about spending 1100+ for the same parts. I had thought about purchasing those myself but am still debating on going turbo one day. Though you can get a set of MAC and BBK long tubes for 50-60 less and those are more common.
They have bad service and they tend to send the wrong parts or missing ones and sometimes not ship parts at all. My dad bought underdrive pullies from them in 2007, and they were missing a few bolts, which took forever to acquire. I was not aware of their downfalls back then, as we had just started to modify our car. Nowadays, I research quite a bit before I buy from somewhere.
Here's several links to complaints about them that I found in a quick google search: