I just lowered mine with Crown Suspension - the 2"/4".
I honestly hate it. The factory ride was nice and firm and now with the new coils it rides like a 1970 Cadillac with no shocks.
When I compressed the factory front coils it took a lot of effort with the spring compressor - in fact i wrecked the first spring compressor that i purchased. The crown coils compressed with ease - I knew this was going to be an issue.
Another thing that sucks is if you bring it somewhere and they use a frame hoist the rear coil springs fall out as they are about 1.5" shorter than factory.
When I brought it to get an alignment they said I am totally out of adjustment and the camber? is at 0 and said he likes to see a -1.
I usually buy mcgaughys lowering spindles and coils and have always been happy. As soon as they come out with spindles I will be ripping the crown out.
I do however like the way it looks although i wish the back was another 1" lower.