* Cost - There is no doubt that buying high end Apple hardware has a high sticker shock. The only way I could justify it to myself is that as a computer professional with delusions of grandeur and an overinflated sense of self worth, I deserve a high end machine =P
* Weight - The MacBook Pro is a heavy laptop. But that's ok, I think of myself as physically stronger than your average geek.
* Crappy Driver support for Win XP - For such a powerful machine with dual boot capability, Apple has some Win XP graphics drivers that are far behind the times. I mean, why can't they roll Nvidia's latest drivers into their bootcamp driver package?
* OSX Quirks - Yes yes yes, OSX is pretty cool, but it does have some annoyances. Luckily all of the ones that have bothered me so far are solved with some nifty 3rd party addons.
* Build Quality - This laptop is the most well constructed laptop that I have sampled, and while I didn't take the time to look at any Asus or Acer laptops, the MacBook Pro clearly *feels* better constructed than a Dell XPS or Latitude, or Sony Vaio.
* Keyboard - This is the best laptop that I have typed on yet. Keyboards are like mice, every person has their preferences. For me, the keys feel solid, with just the right amount of *springiness* and response. Typing is crisp.
* Looks - There is no doubt that when considered from all angles, the MacBook Pro is better looking than all other laptops in its price range. Lately, I've been more into minimalist designs in the things I buy, and Apple's current designs tickle me.
* High End Components - 2.6ghz proc with 6mb cache, 2gb ram (soon to be 4gb), 250gb hd, 802.11n, 512mb graphics card, LED screen.
* OSX - I consider OSX to be a selling point. To me, it feels that OSX took the GUI usability of Windows XP, included functionality from the *nix world (like multiple desktops), and added a heaping spoonful of eye candy. So far, it's seemed well put together.
* Nifty Things - Little things that make me go "hey, that's pretty cool". Examples are the magnet power connector, the backlit keyboard, the autodimming screen, the good keyboard, etc.
* Multitouch - I so thought that multitouch was just a gimmick. When I added a 3rd party addon called Multiclutch, it put multitouch firmly in the category of a must have. I know that Firefox has addons that do gestures, but you still need to click and drag. Multitouch is faster. Now only if firefox can have the appropriate Cocoa "hooks" so that I can have my multitouch AND firefox extensions, I will be in web browsing nirvana. Seriously, I only use safari because I can extend the multitouch functionality with the multiclutch addon.