People will try everything they can and sometimes get burnt over it and then post reviews how .... the airline is and unfair the fare structure because they paid so much to gate check. Um yeah.
I myself spent quite a few hours this last week searching for the perfect personal item, I will post a review of the Fjällräven Kånken Laptop 15" when it shows up. Teaser trailer: it fits both Air Canada and United personal item restrictions and is quite close to be the largest to do so.