Bought mine for $30 on eBay, quality is good, can't really complain. Of course saying that, they'll probably crap out in the next month or so, but again, you get what you pay for.
As for installation, VERY EASY. All a matter of removing the stock bulbs, replacing them with the new HID bulbs (don't touch the glass), plug in all the connectors and mount the ballast. There's a nice flat spot atop each side of the fender wall where I used double-sided 3M tape ($5 at Home Depot) and they won't budge.
Simple.
