Back in 2006 there wasn't a huge influx of products being purchased via the internet.
Now here in 2011 it's highly common, even more so for used things such as scuba gear, toasters, couches etc.
So the stigma and "worrying about the unknown" associated with used gear bought off the internet isn't so strong now.
If you buy used gear I'd buy it via craigslist or scubaboard where you can either trust the members or check the gear for yourself before you purchase it.
I purchased a reg off and it came in pretty bad condition, still passed the service check but it was kinda a pain to deal with. I don't trust the sellers either since I can't always confirm their diving knowledge.
Leisurepro is pretty bad in that they sell products such as Suunto, Scuba pro, and Aqualung, all of which only deal with brick and mortar stores, so you'll lose out in the warranty and customer service in those departments. Now days though they have pretty much sold out all their unauthorized gear. They are certified by other manufacturers for other products.
It all depends how you want to support your LDS's