Yeah I think the wheeled duffles are convenient. Of my 'check in' bags, I have a REI 32 tech beast, REI 28 wheely beast, and Eagle Creek Tarmac 25 (2011). the 32 tech beast might seem 'tall', but is also skinny and a nice bag. both REI bags are also sturdy enough to put a briefcase type object against the handle when pulling.
Other than the traditional appearance differnce and the soft sided vs 'box' build in terms of full vs not full load, i find i use the wheeled duffles more often when i need to pack that much. Of course I'd be careful about not putting anything (at least without protection) that is easily breakable inside.