Ummm I would never say anything bad about anyone else's product without very careful research....
But to make a long story very short... We have a plant in China where we MAKE HID lights on contract for OEM's (car companies)... so I will go out on a limb and give a semi-technical opinion here...
If it is a real HID lamp... There will be a harness and a ballast.
HIDs use an ARC to make light... this REQUIRES a ballast to step up the voltage. It's that simple.
Anything else is a "hopped up" bulb and not true HID. To be fair many of these bulbs are damn good... but they all pale in comparison to a true HID setup.
I have repeatedly asked our engineers to make me a "single housing" solution in real HID and they tell me it can't be done because of heat and space... there will be a separate ballast.
If you want an easy solution, there are several re-sellers on ebay that sell HID kits that include a bulb that attaches in place of the factory bulb, a ballast you can glue/velcro/ screw in place, and a plug the directly plugs into your existing bulb plug. In short no cutting, easily removable. And real HID.
Dig around in Ebay... there are at least 6 guys selling "no cut" HID conversion kits. Most of these kits are pretty good.
Me, I opted for the simple "better bulb" solution.
My 2 cents worth. your milage will vary
