I'm going through a similar decision myself.
Currently I'm a Think Tank guy for carry-on and really like it.
However, I have a bad back and not getting any younger and the weight is really getting to me so I've considered a hard roller. Trouble is with a 20 lb weight limit (or there about) the Pelican - even the Air version - is going to take up half of that compared to the 4 lbs of my Think Tank bag.
I haven't had weight of a carry-on checked often but it has happened, especially if it looks heavy, and I'll be damned if I'll check my gear in. The weight is not an airline regulation, it's FAA/DOT, so the gate crew have no sympathy at all.
Any issues with the Pelican for air travel that you've had?