ofcourse it is. only the default swap partition starts at boot time.
so far with heavy usage it behaves very nicely. looks like a winner to me.

edit: after some time it did become unresponsive. I had to close two microb windows and to wait for a whole minute to respond and close them. all the time I could not even check with terminal or any other way what was using the cpu. when it woke up, i did not reboot and everything was ok again.