I purchased these without much thought as to why they are cheaper than other cam bolts. Other brands appear to have multiple eccentric washer and their bolts are milled down one side so the cam adjustment is done on both sides (bolt head and nut). These have one welded eccentric washer on one side and a standard washer and nut on the other. Now, is this better or not? I couldn't say for sure, but I would think these are more likely to get loose and hinge a bit (requiring more future alignments). But that's just a theory. I would assume if it stays tight, this shouldn't be a big issue.
Another concern is that them being painted makes me wonder if the metal is more likely to corrode than other brands, but again, this is purely a guess.
I won't tell you if you should buy this or the other brands, but I think if you can spare the money, I would suggest the other brands. If you're looking to save some, I don't think this will fair epically, just potentially need more adjustment.
Otherwise, this was an easy install and they're easy to adjust.