Anyone with a SD4000 yet? Upgrade from SD890?

What do you guys think about the SD4000?

I'm not quite happy with my SD890. When my SD450 broke I went SD890 but the bigger case is actually much more of a problem than I thought. I also really dislike the new on/off/preview button scheme. I have "pocket turn on" quite often and it might damage the lens when it comes out. I ended up feeling the better zoom and IS aren't really that important in my point-and-shoot. CHDK on the SD890 is also pretty much unusable since the new button scheme mixes very unwell with activating CHDK.

I see the SD4000 is between those two size-wise and is supposed to have much better low light performance?

Any thoughts on that upgrade? Anyone went from a 890 to a 4000?

I had the SD4000 for a short time before I traded for a DSLR. In that time I loved it's speed (CMOS sensor, 3.5FPS), image quality and 720p HD video with optical zoom..I think it's a great pocket camera with fast operation. The lens is very similar to the S90/S95 at f/2 and zoom range 28-105MM. It also as Av and Tv mode for more control. The only bad thing ..no RAW