I love the progress being made with MWP. I am a huge fan of the tool and I think a more developer oriented system is the best that can happen.
Also I totally craved the MWP 4.0 beta releases and sent in dozens of bugs and ideas. Unfortunately 4.1 does not tease me to do so. I know it is mainly a release for developers. But it does not provide enough benefit for me as an end user to try it. I encountered too many problems and hardly any difference compared to 4.0 and so I decided to quit using it for now. Will return at a later date. I hope that some more visible features will distinguish it from the prior release.
I am not disappointed, I just wanted to share my experience as I think it might be interesting to you