Im a longtime Nimbus wearer, but Not sure I'm going to be able to run anymore, so I switched to the previous model of the Cumulus (one step below the Nimbus).  It's supportive and had good cushioning, just not as much cushion as the Nimbus.  In most Asics I size up .5, and this was no exception.  Because I'm just walking and using them for the gym, these will do just fine. Better than most running shoes, just not as cushy as Nimbus.  Also, half the price of the current Nimbus model