I looked at the Procat years ago. It depends on what you are trying to align. This is a sprocket alignment tool and not a wheel alignment tool. On a unit construction twin, aligning everything to the CS sprocket is good. On a Comet with a separate gearbox or an alternate gearbox, it may not work as well because the CS sprocket may not be lined up with the front wheel. The closer the bike is to stock, the better, but there could be a bend in the steering head, which will present a wheel alignment problem.
I think a nylon string is probably the best sprocket alignment tool. I did buy a laser. I think it was a 10" craftsman level with a laser ($30). I used it for wheel alignment by building a Unistrut clamp that bolted onto the lower part of the front wheel. The left and right Unistruts had a 90-degree plate welded on. I glued a paper scale on each with zero at the tire and going up in inches. The two scales were mirrored so zero was closest to the tire on both sides. I could hold the laser level at the bottom of the rear wheel and rest it on the rim at the front and rear of the tire, but not touching the tire. The laser dot would land on the scale on one side, Then, I would try the other. It takes some back and forth to make sure the front wheel is straight, but eventually, you will see that it is working, or not. If the numbers are not working it is the rear wheel that is out of alignment and you have to make attempts to adjust it into position. When the laser dots land on the same number on both sides the wheels are aligned.
The same test can be done with strings. You do not need a laser. There is still a lot of back and forth.
On my bike, the axle had to be skewed 0.1170" to one side for the wheels to be straight. It ran perfectly at Bonneville.
David