I got my MacBook Pro when I got home on Thursday night. I've used it a lot since then, and here are my observations. Note: before getting my MBP, I was using a G3 iBook running at 600 Mhz on 10.3. Now I'm running a Duo 2.0 GHz on 10.4.5. 
Speed: Wow. This machine is damn quick. I went down the /Applications list, highlighted about five apps, hit Cmd+O and watched them all load up. Things which are noticeably quicker? iTunes is definitely faster. Not only can I watch video podcasts, but the application loads in a snap, and also doesn't spend a lot of time fucking around when you plug the iPod in.
Rosetta: Apple are right. It really is transparent. Bar apps taking about a second longer to load, it really is amazing emulation.
OPML Performance: My old iBook struggled with NewsRiver, often crashing OPML.app whenever it tried to update. No such problems now. Now we just need to build the kernel as a Universal binary, and we're all set.
Front Row: I love the Ten Foot Interface. I hadn't used it before Thursday night. There are some annoyances - if you play a video podcast from the Music section, it only plays the audio. If you play a video podcast from the Video section, it doesn't keep you bookmarked. For watching non-podcast video (including DVD), it's perfect. For listening to non-video podcasts, it's also great. But the video podcasting support in FR is frustrating. It seems a little bit 'unsnappy', but otherwise fine.
Dashboard: Superb. As much as I sympathise with the complaints of the guy who made Konfabulator, I do like Apple's Dashboard and how neatly it integrates with the OS - when you download a Widget in Safari, it just says "Would you like to install it?" rather than forcing you to drag it around to put it in the right place. The dictionary integration is neat. The calendar widget is too large. What I really need is a way of putting all those widgets together in to one SuperWidget.
Screen: The screen is delicious. Nice and big, pretty decent resolution.
Wifi: I haven't really tested the extremities of the wifi. I'm getting four bars up in my loft, whereas my iBook would give me three. I also haven't been able to get on to the wifi networks I use in London. Also, if there's an open 802.11a network somewhere in London, I'd love to try that out.
AFP: I don't use Apple Personal File Sharing that often. It's a bit of an arseache. I used it the other day, and found out that even when I put my Mac to sleep, then wake again, I'm still connected. Very cool.
Sound: The speakers aren't half bad. I'm also so happy that they've got a mic input. The internal mic is rather sensitive and quiet.
That's about it for now.
