Moblin is no where near mature enough to be used by an average user with little to no linux experience...but when its completed LOOK OUT. Its not an instant on OS but its as fast of a boot as I have ever seen.
I second the use of hibernation. The performance hit if any is nothing to shake a stick at. I use it quite often since as mentioned it starts back up much faster but at the same time it is not using any power when hibernated. The more ram you have the more disk space you will use so if you have 2gb of ram and a small SSD
you may not want to do this. I have yet to see my mini use more than the 1gb it has in it and with a 16gb SSD
I don't mind losing that 1gb for the hibernation file.