UPDATE :
After 3 months of weekly use the telescoping handles are broken. The rails can't fully retract into the case anymore. Amazon has generously replaced it, which may fall under the 1 year warranty - not entirely clear.  I'll update here if the second one doesn't hold up.
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Perfect size for carryon (unless the expansion zipper is opened).

Has survived 20 trips so far with zero problems.  Hardshell and zippers are all holding up well.

4 wheels makes this easier to push and navigate through dense crowds than a 2 wheel model would.