I had one installed yesterday and it's worth the money. This is not just my butt dyno telling me. Before my Swarr bar, I already had J&M Lower LCA, Bilsteins HD, Eicbach Anti sway, Nitto 555 and I still had little issue laying power to the ground (Mostly spinning, no wheel hops). When I did some test launches after the bar was installed, it hooked much better. Also, accelerating around the turns, car stayed planted. Before on the same corner around similar acceleration, my rear right tire will always spin.
The thing is, I can't say it will work for all the cars out there. Every car can have different rear setups. It may work or it may not. But I can safely say, if you have similar setup I have, it will definitely worth time and money to get better improvements on your traction. Does not matter if your car have 1000HP, if you can't put it to the ground, you'll see my tailights get further and further.
It took about 2 hours to install with ramps. Hardest part was drilling holes on your differential. If you use 1/8 bit to punch through, 25/64 bit will be much easier to go through.
Before swarr bar, I ordered CHE brace. I tell you what, it's a beauty but had fitment issue so I ended up returning it. Those guys at CHE are great!
Overall, I'm very happy and better stability at the rear is giving me more confidence and peace of mind now.