Took my cat on a four-hour drive and she actually stayed calm the whole time, mostly because the dual upper mesh let her peek out without me unzipping the whole thing. The 180-degree visibility from the side and back netting meant I could keep an eye on her too.
Took my cat on a two-hour train ride and she actually napped most of the way, which never happens. The dual upper mesh lets me peek in without unzipping, and the 180-degree visibility keeps her from feeling boxed in.