That is a bit thin. Anything other than battery? I purchased an extended battery for my incredible at the same time I got the phone so I can't comment on stock battery but I get 6-8 hours of talk out of mine and it will sit on standby for, what seems like, days.
Don't forget, there are of course extended batteries for the Droid X, as well, I just don't find a need for one.
I have a spare battery that I keep in the car for emergency use, but I think I've only used it twice, and that was when I was addicted to playing with my phone constantly, was swapping ROMs multiple times during the day (up to 5 or so ROMS on the phone at a time), and keeping the screen on constantly.
I don't believe that mah vs mah, there's another smartphone that I'm aware of, that can compete with the X's battery life, but of course I could be wrong.
My personal smart phones went RIM Bold 9000 > iphone 3GS > Droid X.
The blackberry wasn't terrible on the battery in some senses, but the constant battery pulls to re-boot, ate it up like crazy. I absolutely had to keep a spare with me. It was an excellent as purely a phone/email device, however.
The iphone was pretty awful, and not being able to swap batteries forced me to purchase an external USB based battery. The apps available was of course the plus side, but AT&T's service went to crap, and I broke the contract on the bounds that the internet service was not as promised.
The X is the first smart phone I've used where I honestly just don't have to worry about battery usage, unless I'm doing massive downloads, installs, ROM swaps, etc. It's just that good. As long as you're careful about apps, ROMs, and how to make sure the battery life is maximized, it just blows away the competition. There are of course tests that prove this, and it's not just subjective.
That said, of course battery longevity can be inconsequential on any phone, if you use an extended battery, carry an external battery and cable, and spares (iphone aside, as it's just awful in regards to battery life, and you can't even swap out the battery without major modification).
//Ah well. I tried to play nice, anyways. I guess I wasted all that typing time.