I've always just used the donut method too, but there's more to it. The secondary, while pointing the right direction, may not be in the middle of the corrector, or the corrector may not be in the middle of the scope. Then this HoTech setup also checks the alignment of an independent focuser that you may have on the back of the scope. However, it just kinda glosses over the main mirror shifting about.
On this C11 there is a dark grey washer between, I'm guessing, a big nut that holds the secondary mount in the center of the corrector and the corrector itself. It's not centered. There's a little bit more washer sticking out on one side than the other. I was thinking this collimator would tell me if the secondary mount is off-center or not. Maybe it did and I just missed it. The procedure for checking that is clearly shown in the videos and the HyperStar instructions, but not the regular instructions.
I was able to get the scope and the target aligned with each other after a bit. I have a bubble level on the scope saddle to get the tube level. I don't know if that helped or not. It looks like you can do it at any angle. They do make a big deal about getting that correct to start with. The funny thing was that when I switched to my Edge 8 at the very end of the day it all seemed to line up instantly. I just had to move the tripod for the target over a little bit, because the scope was a smaller diameter. There are about 12 things going on at a time, so it's tricky. Any movement of anything can throw all the rest off. Just get the initial cross pattern in the center. I had the scopes on my Mach1 mount with the RA rotated all the way over to one side. The rotation of the tube (like the "top" of the tube) doesn't have to physically be "up", so an EQ mount is OK. I'll probably use my Evolution mount for the Edge 8/HyperStar and the Super C8 that I want to check.
Oh, I have V8 of the instructions. They came with a new system. I'll see if I can get the newer ones. The diffuser strips look a lot like Scotch brand Magic Tape to me. They turn the four crosshair lines into a donut, so with or without them works. My instructions didn't say anything about the little target on the 1-1/4 or 2" mirror that you put on the back end, but they must be there for a reason.
Just go slow and get each step right before moving on. I played around a lot just to see what moving each thing would do to the patterns and then sitting for a second to make sure I understood what was going on. Those lasers are bouncing all over the place. I didn't get far enough to try the HyperStar stuff.