I'm wondering the same thing, but have decided to use the stock ones until treadwear becomes evident. The bike paths around here are loaded with tiny gravel and other detritus, so the knobby tires work fine. I keep the tires at 30 psi so the ride is firm. Some folks have changed to other tires and when I need to, I'll follow their lead.
Nice tires. They didn't have those ones in stock when I was looking.. Doh!!
I ended up buying the (Link Removed - No Longer Exists)
Haven't used them yet though. Gonna wear out the factory ones first then go from there.