Hi: Check out the homepage at XLR8 Your Mac. It appears that XLR8 is no longer in business. I just purchased a G4 upgrade last week from PowerLogix. I was considering buying from XLR8 based on customer feedback and word of mouth...I'm glad I picked Powerlogix. Take a look at the XLR8 Home Page. On a side note, I bought the 550 MHz G4 upgrade for my Blue and White. It has worked great and is a noticable improvement over the stock G3.