I recently purchased a new Dell Optiplex 745 system (1.86 GHz Core 2 with 2x1 GB DDR2 SDRAM on a RADEON x1300 Pro).
I put Vista RC2 on this system; got a system benchmark score of 4.2.
Processor = 4.8,
Memory = 5.5,
Graphics (Aero) = 4.7,
Gaming (3D/gaming) = 4.2,
HDD = 5.3
I'm hooked. With a system that actually takes advantage of all of these things - and with a system that actually meets the requirements... this is very nice.
There are still a few bugs - some kernel issues, network printing issues, and some multiple display issues that seem to pop up every once in a while. I've bugged them - and this is shaping up very nicely.
How much does the general public actually know about Vista? How many users think, "This is just another release..."? There are lots of compelling reasons to upgrade; Vista harnesses the power of the latest hardware. If you don't have the latest hardware, it's just more of the same - it's an operating system! But on the latest hardware, you begin to see streamlining in the way you work... you get more work done, faster. The system is more resilient and performs better than with previous versions of Windows. You can feel it.
My T40 (1.6 GHz Centrino) just doesn't cut it. It's a combination of a bad graphics adapter, and slow HDD - but it just feels sluggish on RC2. It's not like the code is bloated - it's just not designed for it. Having used it on the latest desktop processor - I feel the difference.
So anyway: If you haven't looked/used Vista before, start looking. Whether you like it or not, it's coming - so why not start testing? Gamers, developers, casual users alike: Vista (desktop) or Longhorn server have features that you're going to like. You're going to want it. You just don't know it yet... because you've convinced yourself that Microsoft has nothing new to offer you.
Here's my bottom line:
Vista: Start menu has integrated search == productivity.
New kernel schedules tasks better, leaving system more responsive under high load.
User account control means proper escalation of privileges.
Server: Server core. Streamlined wizards/role-based configuration tasks. Actually snappier.