Check out www.autosupermart.com.
They compare the Piaas to Solaris. Solaris comes with a 7-day money back guarantee and a 1-year pro-rated exchange for defects. I have the Piaas on one car and the Solaris on the E. I feel that the Solaris are closer (in color) to the OEM/HID bulbs than the Piaas. Naturally, both are not even close to the HID's intensity. Good luck.