Another good thing about the demo is the intro, which if you like FMV, it will be heaven. The point at which the sergeant cries out for the first time was excellent. It is at least as good as the Warcraft 3 FMV (regardless of what you think of the game itself).
The unit painting looks like a nice distraction, though I doubt I'll be able to come up with anything decent looking, especially with the limited tools there. Could be fun though.
The graphics by default have a high level of mip-mapping, if you look at the readme you can see the command to turn this off, so you get an improvement on the visuals, but at a high cost.
The single campaign map seemed fun, if quirky. The scripting and triggers could often cause problems or make it far to easy, and with no apparent difficulty levels for the campaign to make up for the mediocre AI then it may turn out to be rather unsatisfying.
The animation is fantastic, as is the ability to zoom in and view the combat, which will take a long time before it wears thin I am sure.
The unit customisation is a good idea, but it could do with better explanation as to what each item does, it is often left for you to guess things. This will hopefully be overcome by introducing them through the single player campaign in the usual tech ladder scaling that RTSs almost always have.
The sounds are great in the game, though I'd like a little more noise from the units, perhaps yell and screams during the melee, more akin to the intro they included would be fabulous. Still good without it though.
The population cap seemed generous enough for the maps - all too often I find myself annoyed at seeming a half dozen soldiers representing an "army" on a huge empty map.
The skirmish AI seems to have problems. In one game I saw the AI never go for the main capture point on the 4 way map. In another on a four way free for all I noticed that the enemy has a tendency to all gang up on one victim, meaning that you will either be left alone for an absurd amount of time and be able to build up your forces and base as a result, or you will be raped hard, early and often by all the others. This got so bad in one early game that I ventured out to see where they had all gone and found that two of the teams were gone and the final one had a half ruined base and no units.
Well worth downloading if you like RTS games, and the full game should be great, especially if it allows modding.