Im partial. Guess we will be when the parts are under our car. So... For my opinion I bought a AM rear 4-link clip in 1995. It really was the only thing available, they were the leaders. Easy to follow, and improve, if there is room for improvement.
Lemme say, the frame rails they provide are STOUT!! Dunno if the frames have changed over the years. And what I bought was exactly what I ordered.
Now, a few years forward I decided to change the purpose of the car. Not so much pro-street anymore but more of a nice handling car for the street. Pro tour if that fits. But what was cool is I was able to keep alot of the AM products. And incorporating my stuff to the AM rear clip was painless... Helps when there is a solid platform to work from, and theirs is solid. I have dealt with the customer service a few times over the years. Its comparable to any after market manufactures customer service. Actually some stick out as being above the standard, Air Ride technologies is one.
So I can honestly give a nod to AM, they do provide a good product.. JR
And if yer interested here is a link to my revamp of the rear suspension...
https://lateral-g.net/forums/showthread.php4?t=20605