I have had the Mac Pro for a couple of weeks now and it keeps delivering little pleasures. The thin white rims around the port groups, for example, all light up brightly when you first turn it on, but after a while they turn off so as not to be distracting. The power cord and plug for this unit is black (white, as is normal for Macs, wouldn't do) but the plug is curved ever so slightly to fit the curve of the Mac Pro's body, to sit flush.
Borderlands 2 on my 2012 Retina MacBook pro (2.6GHz i7) makes the fans spin up, and stay spinning quite loudly, the whole time I play. It's a bit frustrating because some levels, if you quit out, need starting over from scratch next time you try it, but I don't like my laptop staying on for hours at full stretch so I can come back to the game and pick up where I left off. Quitting gets the fans back to normal in a minute or so. The MacBook Pro has 16GB RAM and 1GB video card, but it doesn't seem to make any difference what I change in settings, especially video-wise. Those fans work-out. Not on the Mac Pro - but of course, I would have been very surprised if it did.
I like asking people what they think of it. My mother in law got quite excited - but that's because she thought it was a champagne bucket. My brother in law, who designs and builds high-end cabinetry (but isn't exactly computer-savvy - he still uses a 7-year old white plastic MacBook), said 'Wow, that's beautiful. What is it?' Those who do know what it is are surprised how small it is.
So how fast is it, actually? On my Geekbench test, the Mac Pro had a single-core score of 3590. That's more than the 2-core (multicore) score of a 2007 MacBook Pro (2.2GHz Core 2 Duo with 4GB RAM), which was 3122. Of course, each core of the new Mac Pro is running at 3GHz, and it's a much advanced version of the core too: an Intel Xeon E5-1680 v2, with one Processor, eight Cores, and 16 Threads. Multicore, the score is a blistering 25,865. The caches on this thing obviously serve a purpose - some are small but there's loads of them: L1 Instruction Cache 32Kb (but there are eight of them), and same with the L1 Data Cache. L2 Cache is 245Kb (also x8) but the L3 cache is a rather staggering 25MB. The latest Haswell-chipped MacBook Pro has 6MB of L3, as does the Haswell i5 iMac I looked at last year. (The new Mac Pro I have for testing has 32GB RAM.)
Before the Mac Pro actually shipped, someone Geekbenched a prototype and posted the figures: 23,901. The model I have to salivate evaluate beat that, so I guess Apple tweaked a few things before release, or a little software update let a bottleneck free-up, or something.
The main reason the new Mac Pro seems so fast is the two AMD FirePro GPUs. They deliver up to eight times the graphical performance of the previous-generation Mac Pros, but they also help out the CPU when needed ... but as many have noted, the aluminium tower Mac Pro video cards were well out-of-date by the time Apple stopped selling it.