I've been gaming for a long time and I find the interface to be quite good (in general). I've had a few of those "where did they go?" moments that I could had done without but If you want to impove the interface - go to the improvement forum.
I do not have any problem with the supply issues but the WS (as CSA) give me heartburn. You can invest in an area for turns without improving the amt of WS production there.
I bought my game in a store when looking for something new. It has an insufficient manual and one of my pet peeves is that it was printed on colored paper to make it harder to read but artsy!! Arggg!