Now that I have the Nokia E72 for a little over a week, I am going to provide some user experience.

Physical appearance
When I first got the handset, I definitely feel that it is not as slim and thin as the Nokia E71. It looks a little chubby like a Blackberry bold. With the plastic side, it also feels not as solid and not as high class compare to the E71. Nevertheless, the black color model gives a distinct feel, with good keyboard layout. However, the Hong Kong model’s keyboard is also printed with the canji chinese input method (along with roman numerals and the alphabets), making the layout confusing and hard to read. Personally, i think the spacebar now is a tad too short.
Battery
One of the selling points for the new E72 is a more powerful CPU and thus a longer battery life. Having used the E72 for a bit over a week, I am definitely not seeing any battery improvement. In fact, I need to recharge the battery more often. Discounting the first couple of days when I experiment different applications, and settings, I have now gone back to having just email as a constant on application. The phone usually last 2.x days, with the battery guarge lasts more than 1.x before dropping from the 100%, once the battery starts to go down, it will need to be recharged within a day. I have also switched from dual mode to just GSM mode to obtain battery usage.
Stability and performance
About 90% of the time, I would say the E72 is a lot more responsive than the E71. However, the E72 sometimes just freeze. It is definitely (for the applications I use) less stable than the E71. Nimbuzz for example, will crash randomly (I have reinstalled and rebooted a few times) at start up. This applies to the built in apps such as the Calendar, Contact and Messaging. A long press to bring up a new Calendar entry usually takes a couple of seconds (instantaneous on the E71). For Contact, the long press does not bring up a new contact entry screen (a bug)? For Messaging, the long press does not allow me to configure to a new sms message (it goes to one of the emails by default).
List of applications I have on the E72
Nimbuzz
Google map
Google search
Skyfire
Calcium
Nokia Photo Browser
The verdict
I definitely miss my E71, I hope Nokia release a new firmware soon. Despite of the short comings, a few items worth noting:
- fast CPU
- 3.5mm headphone
- built in accelerometer (works in Nokia Photo Browser)
- Arguably, better music
- Arguably, better photo
- I miss the A4 Input (chinese input application by Nokia)
- the Optical Navi key works, the D pad is quicker