I bought 2 sets from DDM (55W, compact ballasts) and for the most part, I'm pleased.
I have installed 3 other brands of HID kits over the years and the quality if these DDM kits are good. The only complaint that I have is that I ordered 5K kits for both high/low beams and the low beam color is dead on (from the looks of things) and true to description. My high beam kit seems like it's a 6K color lamp. They have a blueish tinge to the color when fully warmed up. There is a definite difference between the two.
I have 6K color lamps in both my truck and my wifes car, so, I'm familiar with the color. If I had to do it all over again, I would have used the 35W kits and saved a little wattage. I don't think with the projectors that the 55W is really needed.
Shipping was decent with DDM but one kit was lacking instructions that I didn't need anyway. I'd definitely buy from them again and stay away from the Flea-Bay sellers that are out of country.