Picked up 2 7" Kragen HID lamps last week. Swapped out my middle 2 Piaa 520's for the Kragen ones.
Paid $99 each. Wiring was simple as they have built in ballasts. Just power and ground, comes with an inline fuse. I would definately add a relay if you install them, just for safe keeping.
Compared to the Piaa 520's, of course they are just regular bulbs, in size and brightness, makes my Piaas look like baby lights lol. But the Kragen lights light up dark streets really well. I will take some photos after I reinstall my HIDs in my headlights.
The pattern is more of a wide, everything forward is lit pattern. lol.
Side comparison w/ a Piaa 520