I have a Briggs and Riley two wheeled one that I absolutely love. Can't remember precise measurements but it's bumping up against the max.
It's really well thought out and even features an integrated suit hanger compartment in the lid (albeit not one I would leave a suit in for too long if I wanted to wear it immediately after I disembark.
One thing I would say is that this thing does such a stellar job of allowing me to cram stuff in, that I'll use it to do quite long trips with only carry on, and as a result it can actually end up really heavy when fully packed. So while I have never actually taken anyone out when lifting it down from the overhead bins, I've come a little close once in a while.
But aircraft wise I have not yet found a BA aircraft I couldn't get it in. Even the 190s out of LCY!!!
So I am firmly in favour...