Bram,

I use the metric system at work every day. I find it eliminates 99% of my measuring errors. The only time that I have any problems is when I am lying under a car taking measurements and then transfering them to a the data sheet that is a bottom view but I am looking at it from the top. This however is a stupidity problem not a measuring one, and I would have this in any system.

I did most of elementary school in the imperial system and didn't switch to metric until part way through the 7th grade, so I can use both. I just find that with metric I can calculate much easier.

I also find that many people don't know what those little lines of different lengths mean, on an imperial tape measure. I have heard several people saying, "Okay, thats 12 and 3 of those little line things." or "That is 12 and 3 of those little-bit-bigger-line-things." This is not very reassuring to hear when you know that the tolerance on a car is 1 of those little-line-things, but only half of 1 of those little-bit-bigger-line-things.

Ian