Have you tried Windows Defender or Microsoft Security Essentials?

[Ashwin]

I have tested many free security products, but i have never tested Windows Defender or Microsoft Security Essentials. I will be buying a custom-built PC for a friend this saturday and i want to try out one of the above security solutions instead of a premium Anti-Virus.

Is MSE good as Avast or Avira? And is Windows Defender compatible alongside other AVs?
I know it is just an Antispyware, but it does run in realtime, doesnt it? Will it conflict with AV?
Usually i disable Windows Defender on Vista PCs, before installing any AV. So i have no idea how good it is.

I would like some feedback on this,could anyone use this format to reply:

Windows Defender/MSE comparison
1. Scanning speed
2. Scanning Accuracy
3. Removal of threats
4. Real time protection
5. Updates (frequent or once in a while?)