I use the older piggy-back rollerboard and their flight kit. I love it. I fly way to much, and it takes the abuse just fine. I ended up having to replace the bearings on the wheels every spring, due to rolling them in the parking lot through salt and snow, but at the cost of $15 for 20 bearings, that's fine with me. It fits into the overhead of a RJ-700/900, and can roll down any aircraft aisle without getting caught on every seat.
Customer service is top notch. Had an issue with my flight kit zipper and called about the warranty. They spoke to the owner (as he is a pilot himself), and they sent me a brand new flight bag, told me to keep the old one to get repaired and keep as a backup or sell.
I'd call and ask them about an aircrew discount btw.
Just as an addin: I've used the piggyback II for almost 4 years now. The handle broke (due partly to me), and they 2 day fed-ex shipped me a brand new handle with no questions asked.