My Yukon D30 4.56's have been great, no complaints. In the rear I was sent Quality Gear 4.56's, they too have been great.
The Yukon master install kits are great as mentioned, they even include inner axle seals which most kits do not.
Genuine is the only one i heard to stay away from, whether that's bunk or not, i do not know.
Tomato, tomahto. -B