QUOTE(gabe_ @ Mar 17 2008, 05:39 PM)

Do I have first hand experience? No. But by comparing the specs of 802.11n vs. eSATA I don't really think I need to. You can pick up 500GB eSATA drives for $130ish which will work wonderfully with Time Machine, AND be faster than a Time Capsule.
There is not enough added value in the "wireless feature" for me to spend more money, AND take a performance hit.
Different strokes for different folks

A few more things to take into consideration.
QUOTE
Backup for everyone.
Have multiple Macs in your house? Time Capsule can back up and store files for each Leopard-based Mac on your wireless network. No longer do you have to attach an external drive to each Mac every time you want to back up. Time Capsule spares you the work.
I don't think you can have more then one person connected to a eSATA drive for backups at the same time. And even if you could, I wouldn't want several long wires going around the house to connect to my external hard drive.
QUOTE
More than just a wireless hard drive, Time Capsule is also a full-featured AirPort Extreme Base Station with 802.11n technology. Experience a high-speed wireless network and a breakthrough way to back up all the Mac computers on your network. All in one device.
So when considering the price tag you may want to take that into account. But I admit it's not all that as you can certainly get cheap wireless routers nowadays.