Questions to X3 users from an X2 user

Howdy,
I upgraded to X1 tempted by the skylight interface and prochannel. Then I quickly jumped in with both feet and upgraded to X2 cause I really wanted track lanes to work. However I have had issues that have been frustrating during sessions, and was really disappointed that a further update did not happen before this release(X3). Before I consider X3 I need to know a few specifics:
 
1) Track lanes - I have had an issue with track lanes where previous takes will play, even when muted. Its intermittent but muted take lanes will be audible, forcing me to unmute all the takes, mute again, sometimes even save and reopen a project so I can continue a session. This is my biggest current headache - are the new Take Lane/Comping features more stable?
 
2) ProChannel - While crashing issues were resolved, some modules can be noisey, especially when adjusting during playback. Having compression on a lot of individual tracks may produce instability...is this any cleaner/more stable?
 
3) Smart Tool/Smart Grid - is it any smarter? I liked the basic use of this in X1, but the way it decides to change the grid settings while editing seems counter intuitive for some tools in X2. For example, when working with transients I find it constantly reseting to 1/4 or 1/8 when I am working in smaller increments. I know you can turn these features off, but once its at the point you have to turn things on/off to use them, it seems no longer usefull shortcut.
 
4) Melodyne and Izotope RX2 - I use these tools as part of my workflow and had a lot of issues trying to use them in X2. They didn't integrate well at all and I found myself exporting tracks and working outside of Sonar to use these tools then bringing them back in afterwards. The clip fx tools just weren't working well:it was hard to cue sections, I had drop outs or weird inconsistencies between clips - over all the process in X2 was pretty much a mess if you had to work on larger clips or had to edit something in the middle of a clip. Does this work any better in general? If you have a full version of Melodyne is it fully functional within X3 without being glitchy?
 
All of the above are features advertised as steps forward in X3, but I was hoping for user feedback, especially those of you who have used X1/X2.
 
Lastly - I know there has been whining for a while on these, but: Has there been any noticeable improvements with either Notation or working with Video? ANY? I understand that Notation is not a focus, but my last midi import from Finale was a train wreck which requires a thread in of itself. And I don't expect video editing features, but importing video should be easier. Issues with format, codecs, and compatability should be improved - I mean you can't get people to check out music online without a video. I can't control what clients send me for clips, so playing a guessing game on what will work or not and keeping converters on standby whenever a new project starts has become more involved than it should be.
 
Thank you - I look forward to hear your input and opinions.

Thanks dd, that's very helpful. Those 2 improvements alone would make a huge difference in my workflow.

+1, as someone who had terrible experiences with X2, I have been pleased with X3.