It sounds to me like there is a hardware issue here
Battery life should not be an issue on a new mac, and the spinning wheel might be a cpu problem.
Now I will tell you what will give me the spinning wheel and issues in general:
FLASH
It runs like crap on Snow Leopard, and Apple and Adobe hate each other.
This is the only issue I have with my macs. Everything else is rock solid.
Now Windows 7 ... my co-workers and I had to get rid of our Windows 7 laptops because of:
1. Blue screens of death 2-3 times a week
2. Losing docking station connectivity, with Windows complaining about "unsupported hardware"
3. Black screens of death on 64bit windows 7
4. Crappy interface (what is the point of the little windows on the bottom of the screen if they are too small to read?)
5. Issues with MS Office: corrupt indexing service, application crashes, etc.
Windows 7 is the worst OS I've ever used: it is even worse than ME.
Now XP was just fine
With OSX Lion, there will be bugs and issues out of the gate--it is a new OS, and I don't recommend that anyone who isn't technically saavy with their Macs, jump right in.