I love my mini, people make it out to be slow and lacking a bit, not for me. I love it, I'm able to listen to music while working in Lightwave 3D, I run big apps simultaneously. The only issue I have is it has 512MB which means the spinning ball makes an appearance from time-to-time when switching between big apps (like After Effects, Final Cut, Soundtrack, Photoshop etc.), that would be sorted with 1GB of RAM, also an external USB2.0 hard disk is critical for me.
I did think of it as a 'transition' machine, but now I'm settled on it, I've an upgrade path clear in my mind: 1GB RAM, a 200+GB USB HD, an external DVD writer, all of which I'll pace over the next year or so. When I physically cannot run applications anymore, THEN I think I'll switch to Intel (unless circumstances change and my partner leases some Macs via the company). If companies make software which purposefully shuts me out, then **** em, basically. I'll use an alternative, it's not an issue at all.
It's a great computer, the best I've ever had and I come from a Solaris SPARC and Linux/BSD PC background. It has opened a whole new world for me in terms of creativity, making music (me? making music??), rendering movies and graphics.. (me??? making graphics??????) it blows my mind every day, it's a miracle in a box and a real joy to own. I can't give objective results but I can tell you this, I can rip a CD in iTunes like lightning, compared to my partner's Athlon 64 bla bla PC box, good enough for me.
It's been on virtually constantly since we got it early last year, only sleeping when not in use, never had any problems, it's completely reliable and trustworthy.
I love it, really.