I bought these for 3D modeling and 3D printing and will probably buy 2 more to make up for them to give to my nephew and son to encourage them to do the same. The caliper I received is well built and does not have the flaws I have heard complaints about and I am impressed with the quality for the price I paid. Most complaints don't make sense to me; perhaps they were written by people who have never worked in a machine shop and only know how to use a ruler. A common complaint I've seen is that "inches" is broken into decimals. This is normal for machinists; I inherited many things from my grandfather, who among other things made milled parts for Howard Hughes and the traditional "imperial" scales for machinists. Yes, it's hard to get used to, but if you want a traditional scale, this is NOT the tool for you. Regarding the comment on "why 4 points": It's a hand-read scale, so it can't be too small on this page; You should read more fractions from the top right. These "4 ticks" equal 0.025 inches. "5 ticks" as the commenter seemed to want would be 0.020" and the math actually becomes more complex for the machinist. If you learn to read the "upper tape" correctly you can use a higher measure measure by accuracy. As for the bike, I disagree. I have disc brake calipers and they only have a thumb rest, but for what I do it wasn't a problem. Maybe with practice it could get used to.