"Very nice, but not as good as CS3"3.5 starson by Superskateman
Pros: Great quality animations, nice interface, easier Tweening than previous
Cons: Line tool lines do not connect together as well as CS3, old users will have to adjust to newer interface
Summary: Last December, I got Flash CS4 for a Christmas present. I was very excited because I loved using Flash CS3 which was installed at my high school's computer lab, and Macromedia Flash 8 which was installed on their library computers. I loved Flash 8 from the start. I didn't use layers, just moving, non-animated Stick figures. Later, when I used CS3, I started with layers. Well, I'm getting off topic here.
I open up the program and immediately wanted to make a clone of YouTube member TomSka's asdfmovie. I drew all the lines, but when I put the paint in, it didn't work. It wasn't until later did I realize that when I zoom in up close, you can see that it wasn't connected, so it didn't work.
Another thing I noticed was when I was going to change my framerate (I use 33fps), I couldn't find the bar at the bottom like in Flash 8 and CS3. I never looked in the Document bar when in older versions, so why would I have to look now? Apparently, because I can't find the bottom bar. Later I find that they added a new tab interface on the right where the Library is, but it doesn't have the fps showing.
A problem I also have is that I can't import my videos. Great, now what do I use to add little fun censor bars or light sabers?
Now, enough with the cons. I love the new motion tween. It's very nice to use. Now I can see where the motion is going in the same frame. Though a problem I have with it is that I can't change out of the tween in that layer unless I remove it altogether.
The rotate tool is also helpful, but I haven't found out, if possible, how to make a 3D item to rotate. For now, I'll just stick with the free transform. The bone tool, I haven't figured out what it does, but I haven't had to use it in 6 months, so it's no use to me.
All in all, it's a great program, awesome if you use the student discount (Though they might have already replaced it with CS5 in Adobe's Student area). But if you're an experienced user, don't upgrade and stick to CS3, 8, or MX.