Dell E6440

Keyboard: from my perspective worse than in T500. Finding F5 of F9 without looking would not be easy. No separated Del/Home/End/PageUp/Down block. Similar, yet somehow less intuitive cursor block indentation. The problem is no one if making "proper" keyboards since T420/T520. On a plus side: separated volume up/down buttons - something that is missing in T440/T550 (equivalent generation from Lenovo).
One pretty annoying thing is squeaky sound from right Shift button - I'm guessing this button might be slightly too wide for used mechanism.

Bottom cover is made from metal, but when detached it is rather thin and flimsy - this is not like T500 back cover that could basically be skeleton. It is held by 4 screws (3 on the HDD/left side and in the center) and - at least on my unit - it does not fit perfectly on right side. I wouldn't mind few extra screws.

Rather weird looking speakers, with two membranes each. Magnets are quite strong and they are catching metal dust. One annoyance related to built-in speakers is pretty loud pop sound each time integrated amplifier goes to active state. Fortunately I'm not observing this when using active speakers connected to headphone output.
The good: battery life at low backlight level seems excellent - for my 48Wh (effectively) battery work time is estimated as 9 hours.
I hate that battery is not identical to battery from E5440 - I have spare battery of this type, it has the same electrical connector, almost identical size, but different notches and latches in plastic case are making it electrically incompatible.
It is very easy to recover Windows - Dell supplies tool that creates bootable USB.
Buttons for trackpoint are disappointing (buttons below trackpad are OK) - they need to be pushed all the way down but they are flat and have no tactile feedback.
My previous laptops were Thinkpad R500 and T500 and comparing to them E6440 seems little loud and hot - fan is spinning in situations when it was idle on thinkpads. Currently I'm using ThrottleStop I'm experimenting with undervolting using ThrottleStop with voltage offset -95mV for CPU Core, Intel GPU and also for CPU Cache. This might be helping a little, but R500/T500 still were better.
Display viewing angles are poor, but on the plus side there is no visible flickering starting from third (out of 16) level of brightness. Brightness is also noticeably higher than on '500 series thinkpads.

Note: to get service number run wmic bios get serialnumber