Both my son and I use them, and like them. We've used them weighing both Triple Seven powder and BH209 without any issue. As for the numbers being difficult to read, we have no trouble, but I have seen where folks have coloured in the numbers and lines to make them more easily read.
Admittedly it is the only powder measure I've ever used, but I can't see any opaque or brass model being as easy to use. It is nice to actually be able to see the charge in the measure before dumping it down the muzzle.