I have the Maximum Motorsports one in my car and I am pleased with it. Install was easy, their instructions are very detailed with pictures too. You can run the stock control arms with it if you need to. First thing I noticed is the car shifts smoother than with the stock K member. Its not as light as UPR or QA1, but its meant for road racing/street driving so they made it a bit stronger. If you are going for the lightest one out there go with UPR. They seem to have good feedback on the k member and you can get coilovers and lower control arms with it for $699 I think.
yeah i've installed a few, let me know if you need someone too install, you can get the full tubular set up or get a k-member too use your stock control arms... let me know. i like them, you can work on the bottom of the engine alot easier...
i have upr k member,and a arm and coil overs havnthad chance to realy try it yet though,looks mint way more room under hood=better cooling,and huge weight lose,my front tires rub though because upr k member moves them up 1 inch.