The demo 1 had some drawbacks and bugs and have been considerably improved since the demo 2 (only access to those who pre-ordered), then the release + Patches 01a and 01b.
Anyway, If I well remember this demo 1 (so long ago, I mean 3 months
), it was sufficient just to have an idea of the concepts of this game (i.e. not the same concepts as ETW/NTW ones for example
).
So, if you agree with this concept, I think that you may buy on trust the current version even if it remains some imperfections but that do not prevent you from playing.
At least, it is my opinion ...
PS : I think that JMM will update the demo but up to now, the priority was put on the release. So I don't know when it will be done.