Thinking of getting H4

I have been hosed and frustrated by the H3 ever since I got it in 2003, I do some pretty cool shows in my mind LD/Programer and the the 3 has alway just made it, but
there has been times when it has hurt my confidence and if you know what I am saying you will understand it is alway in the back of my mind there is will it do it
again !!!!
SO please anyone who has a H4 answer these questions.
1. Is the H4 stable ?
2. Are the faders doing strange things like o the H3 ?
3. I do a lot of Fast updating in rehearsals dose it lag at all on update/ merge ?
4. Is merge working
5. Is there any strange bits when changing pages?

Thank you for any response just want a console that as fast as I am and don't want to look more of a twit than I already am,