They do work, I used 8 ft fluorescents and a framing square to do the 4 wheel (IRS) alignment on my Daytona Coupe to get it to handle at speed. I actually took some rough measurements off a Porsche Turbo Carrera in a parking lot, lol. I had several alignments done that just didn't handle right: one day I was behind a Porsche on the highway and saw the negative camber on the rear wheels, so I duplicated it.
Anyways, back at it again today. I machined the spacers down to .50 and installed them. This netted me about 1" and I'm happy with the stance.
After that, I played with the adjustable bushings, taking it for a ride around the block each time I made an adjustment so it would be settled in. Once I was happy with it, I did the toe again.
I took it for a long ride and the steering started feeling a little weird; the springs settled in a bit and my camber and toe changed.
I'll make a adjustment again next week, now that I know the height is where I want it.
Enough work, now it's time for some of that #27 Jack Daniels.