As long as the two piece would fit your head and body frame in armor, they are great helmets. Definatly better than the 1 piece offerings from Rubies. The main question is will it fit your frame? They are most commonly used by women and children however, slighter framed men can use them as well.
The key with the 2 piece helmet is to fuse it into one piece and hide the seam on the exterior of the helmet. There are several WIP's and tutorial threads on how to do this. Once that's done, if you get a #5 dark green welding visor for about 5.00 from the store provided in the "LInks" area of he forums or from a local hardware store, you can trace the old visor onto it with a crayon, cut it our with scissors and glue it into the helmet.