Hmmm. I thought they were the best you can get; and love how they pack neatly away. Almost bought the Colors set this weekend at my lfs.
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Joni, if you are pulling the inside part of the plunger to the top because of the air inside the syringe you are pulling it too far. The air bubble is not a flaw in the design of the syringes. It is there to compensate for the volume of liquid inside the needle that you cannot see. For an accurate measurement pull the inside of it up to the point to where the bottom meets the 1 Ml measurement even if the air bubble keeps the liquid at .9 or even .85 Ml. The other .1 or .15 Ml that the air bubble takes up is because there is that much of the liquid in the needle tip of the syringe. If you fill the liquid up to the 1.0 Ml line and the plunger is above that due to the air then your readings will be off and you should measure properly againI use Red Sea also and its a breeze to use. My 10yr old daughter knows how to use it perfectly and she also check all parameters. She's good at it! When using the syringe pull all the way to the top, the fluid usually fills all the way to the 10ml line and I dont use the 5ml syringe as I have a 10 ml syringe to fill the bottles with water.
I only have one problem with Red Sea and you didn't even list it. The numbers/ lines easily rub off on the syringe. Other than that they seem pretty solid.

