Having owned this for a few months, I must say it is not an improvement over the old model. I use the Time Capsule with a Mac Mini and mid-2011 MacBook Air. Here are my issues:
> 5GHz connection is flakey. It tends to stall, then creep along, and then become non responsive. This is almost daily occurrence.
> Oftentimes, TIme Machine cannot find the Time Capsule, so there are many missed backups. I have to unplug the Capsule to get Time Machine to see the disk again.
> About once a month, Time Capsule will say it cannot find the backup, so it has to create a new one. I can see and open the file in Finder, bUt Time Machine won't see it. Never had this problem with my older version Time Capsule.
> The connection is just slow. I have compared it to our U-verse modem's direct wireless connection, and the Capsule seems about 30% slower in side-by-side comparisons.
> External HDDs plugged into the Time Capsule are not reliable. About half the time, Finder on my Mac Mini cannot see it until I reset the Time Capsule.
For future backup needs, I will buy individual external disks and go with a more standard wireless router from the likes of Linksys. As much as I enjoy Apple products, I cannot recommend this one.