Oh, wow. I just posted my review of the Zephyr in the Bag Review section, then came here to see your question! Maybe this will help:...

I've had my Zephyr (Black/Black/Steel) for just over a year (time flies!) and have used it every work and travel day. I absolutely love it. I got the absolute shoulder strap for carrying it, which...

Oh! I just went through this decision! I actually ordered both and sent one back. Here's my impressions:
1. They're both great. You probably can't go wrong.
2. Get the Zephyr if you want...

Not much since it's still on the truck! Looking forward to figuring it out when I get it! :)

This is pretty cool. I've added one to my Zephyr order today!

Looks really great. Any chance we can get a few more pictures of what else might fit in the main compartment at the same time as the cache?