I bought them twice now I have a bad fall (steering wheel not working) at wheel alignment shops with fancy gear. The apparently bizarre equipment doesn't offer accurate alignment due to operator error, so I don't have much faith in the alignment shops who can consistently align my vehicles. I just used them after changing tie rod ends and was happy with the results. Easy to use, one man operation, solid construction and even a nice metal finish. I suppose you could do something similar, and they might be a bit pricey, but heck they pay for themselves in one use if all you want is full finger alignment. I think with a little care you can get pretty accurate alignment out of them. If you are unsure of your measurements, simply drive your car a little and measure again. I also think the pin on rim system they have might be more accurate than wearing the plates on the tires. The conversion table is also a great way to save time as you would likely look up this information and forget the numbers without it. Years. Incidentally, the company has a couple of short how-to videos on YouTube - if you're not sure, watch them before you buy.