With his helmet on, the Clone Trooper Sergeant is closer to 3 7/8 inches; that makes sense since his armor and helmet add a bit of bulk. Like the majority of Star Wars figures in the smaller scale, the sergeant is sculpted in such a way as to fit in with the standard movie based figures (rather than figures based off of the animated series).
This guy is really well articulated! While Marvel Universe and G.I. Joe figures typically have standardized articulation, that hasn't necessarily been the case with Star Wars figures over the past few years. While there have been ball joints present, they haven't been completely standard. This guy has them, though, and they work great. He features: ball jointed ankles, ball jointed knees, ball jointed hips, a ball jointed abdomen, ball jointed shoulders, ball jointed elbows, ball jointed wrists, and a true ball jointed head. The range of motion is quite impressive. The sergeant can hold a great crouching position and hold either of his two weapons with both hands. Superb and very, very durable.
This is a really good figure. I can't say it's a figure that exciting in the way that expanded universe or never before released characters are, but it's a really good figure. I know there have been a few releases of the Clone Trooper Sergeant before, but this is probably the best. The first series of Star Wars Black figures in the smaller scale were originally intended to be released in another Droid Factory series that was canceled, but that means that this guy is now just a bit easier to army build if you need some sergeants to lead the rest of your clones. I think this guy is easily a Great figure, so that's the grade I'm giving him. While these retailed for around $10, they seem to be getting harder to find and since the second series of the 1/18th Star Wars Black figures is starting to hit, you might need to snag him sooner rather than later.