I think Eagle Creek may have changed the designation of this bag. A few months back, I bought a 19" version, at that time called "Tarmac Plus One". That line seems to have been discontinued -- or maybe the line's been renamed "Traverse Pro". In any case (no pun intended) I liked the 19" Tarmac Plus One so much that I bought its slightly larger (but otherwise similar) cousin, the "Traverse Pro 22". The features I like:

* Two-part case, easily connected (and disconnected) with sturdy zipper.

* When disconnected, the front (the "daypack") has a thin "slot" at the back that slides over the extended handle of the back of the case. When you're rolling it behind you, the daypack stays put (in my experience, for most roller bags, if you put another case on top of the roller, it tends to spin about & drop on the floor -- but here, the narrow slot holds the upper bag very steady around the handle).

* The handle extends a long way - easy to drag the roller behind you without catching your heels.

* The daypack has several well-designed pockets (they differ a bit between the 19" & 22" versions that I have). Both versions have laptop storage, pen pockets, places for paperwork, etc.

* The daypack has backpack straps, but they can be neatly tucked away. I tend not to use them -- I just use the handle on the top, to carry it like a regular laptop bag.

* Very easy to roll onto a plane, put the bottom half in the overhead, and slide the daypack under the seat.

* As usual with Eagle Creek, very solid manufacture -- it'll last for years.

So, lots of Pros. The only (slight) Con is that the lower case is pretty much devoid of features. But that's OK, it's meant to be the main storage area for clothes etc: and it does that just fine.

All in all, highly recommended. My only problem now is trying to prevent my wife from grabbing it when we're going on vacation :-) !!