I have the zero-offset front kit from mgchevyparts on my car.
I had a few quirks but all is good now.
#1. Take the screw-in studs out of the hubs and put Loc-Tite on them and torque them down with a torque wrench. They are a pain when they come loose when you are removing lug nuts.
#2. He shipped Chinese made bearings with mine. They didn't match brands on both sides either but they were both Chinese. I replaced them with Timken.
#3. The brake pads squeaked like a Mac truck. I replaced them with Wagners and now they are perfectly quiet.
#4. He "upgraded" me to steel braided brake lines. But, they weren't DOT approved ones. I didn't like them either because they kinked really easily. I replaced them with new rubber ones from O'Reilly's. I found that early 70's Caprice hoses were the perfect length.
#5. I had trouble with the calipers sticking. I bought a new set at O'Reilly's and it solved the problem. However, I did this at the same time as doing #4 so it could have been a kinked hose causing the problem. But calipers are cheap and I was tired of dealing with the issue so I replaced them.
I bought the master cylinder and rear kit from mgchevyparts as well.
There was one issue on the rear kit. The rotors would not center on the axle because the center hole is slightly larger than the axle flange. Mike knew about this too and ignored the issue. I figured out a work around by centering them with a feeler gauge on a fixed point while rotating them by hand. When I got them centered, I drilled 2 holes through both the rotor and axle flange and installed centering pins into the axle flange.
There was an issue on the master cylinder also. The included seal to the firewall was a joke and in no way would work. I ended up making my own from a small piece of steel tubing.
Like I said, the brakes are perfect now. I love the way they feel. Would I recommend mgchevyparts? Yes, but I do point out the issues I had. I have seen others report that they didn't have the issues with the bearings and hoses.