Had mine since July.
Ditto previous posters really - quality is incredible. The 5D2 mercilessly shows up poor technique and lens quality - you'll want to keep the shutter speed above around 1/200 sec to eliminate camera shake.
I think the 5D2 is a real photographer's camera, and would especially please someone (like me) who has moved on to digital from film - both in terms of the image quality, which is as good as fine-grained film if not better, and the identical field of view compared to a 35mm film SLR. People harp on that the AF isn't as good as the D700, but the 5D2 has clearly been designed for landscapes, weddings, portraiture etc., where IQ is the primary consideration. You pays your money..
Yes, you need decent lenses to get the best from it, and the 24-70L is a wonderful match for the 5D2. I have a 24-70L, although strangely enough I keep finding myself being drawn to using my 50mm f/1.4, which also delivers pin-sharp results, and is satisfying to use in a way that only a prime lens can be.
Build quality is solid, and I admire Canon's decision to leave out a built-in flash. If you need flash, get an external unit that does the job properly. The self-cleaning sensor is a big improvement over the original 5D - I've noticed the odd dust spot on a frame that disappears in subsequent shots, so evidently the dust-resistant coating and vibration system is doing its job. The 3 custom settings are well worth having, and even though there are some fancy auto modes that the original 5D didn't have, you'll probably be the sort of photographer who sticks with Av or manual mode.
Con's - not many! The auto ISO is a bit limited - the camera tends to select the slowest shutter speed it can get away with, i.e. the reciprocal of the focal length being used, which as I've mentioned above is a bit too slow if you want to avoid camera shake completely. It would have been nice to be able to lock in a shutter speed/aperture, and let the camera set the ISO, but auto ISO doesn't work in manual mode. Maybe a firmware update could fix this - hint hint Canon?

Yes the RAW files it creates are enormous, and at 25mb or so each they eat up cards and disk space fast - but this is the price you pay for superior IQ.
I've not used the video or Live View, but they're both nice to have should I ever need them.
A.