I bought this on the spur of the moment to replace my old white G5 iMac.
I've been using Macs since the early 90's and owned an iMac since 2000, so I'm familiar with the plus and minus points of Mac ownership.
The first impression of any Mac is cracking open the case and marvelling at the packaging. This iMac is no exception, Apple have surpassed themselves, all the accessories and manuals fit inside a keyboard sized box. You'll have the machine up and running in minutes.
Next the migration assistant was so nearly excellent, it copied everything across from my old Mac and only let itself down by getting stuck in the last minute or so of copying.
So how does the machine work? There are really only surface differences so far between my old machine and the new one. The Leopard iCandy
is nice but often gets in the way, Time Machine is excellent but I've not had to recover anything so far. I've also had two kernel panics in the early days of using this machine, mostly I think because Time machine and my anti-virus package don't play well together (make sure to exclude all your backup drives/ partitions from TM's preferences).
The look of the new machine is great, but as noted elsewhere the keyboard is probably a step backwards, the Mighty Mouse is a huge improvement over the one button mouse Apple used to ship. The screen is HUGE compared to the my old 17" iMac and this is also a big improvement, although the screen isn't suitable for Professional work - it's fine for what I need to do.
The only place this iMac really lets itself down is the miserly approach to RAM (memory), 1Gb simply isn't enough. I've upped it to 2Gb, but I think it's such a memory hungry beast that I've got 4Gb on order. Don't buy Apple's RAM it's extortionate - check Crucial first.
I'll also need to replace office 2004, as the emulated speed is quite painful.
So overall very good, with just a few minuses.