Anybody use Apple's Time Capsule? Thoughts on its utility?

Is it worth the money? Do Mac Time Machine backups work as seamless as it is made out to be? Also in a mixed household with Windows machines, are you able to access the HDD in the Time Capsule as network connected storage from the Windows computer? Also what (if any) files from the Time Capsule can be accessed on an iOS device.

Please indulge a Time Capsule noob. TIA.