Some Hoplite masters here.
Single part is very desirable when dealing with metal miniatures (for me anyway), and I'm happy with how close I've got with these - it's just the right arm that will need glued on when assembling them.
Having the right arms as separate pieces allows more dynamic poses and brings a bit of life to the sculpts by adding in a second plane, otherwise the minis are flat. It also means they can be assembled with either spears or swords.
Thanks for all the emails I get chasing these up. I'm trying to get these perfect before I put any up for sale...