I have a small flat, I have my kingpin in the hallway so I have to turn the hadlebars just to get to the front door, Sunlova folder (winter bike) in ulility/storage room so I have to climb past to get to the dryer and I have a Cresswell Fold-it in bits scattered around the living room awaiting time and parts for rebuild. I have my 3 bike Minimum, they're all folders due to space restrictions. The Sunlova is not at all stiff but it was less than £100 brand new. The Cresswell is probably the stiffest out of the three but the kingpin is a close 2nd. What this means in real terms is less of your power is lost in flexing the bike.