Blue doesn't enjoy the process of being trussed up, I always have a tussle with him to get the harness on, (whichever one I'm using) but I think he regards it as a game and a chance to get teeth on flesh
Once it's on, it stays on for the day, I'm not physically strong enough to repeat this several times a day.
Setting off on a walk, he walks nicely and doesn't pull, but at this stage he is in full on sniffy sniff mode, so we stop at every blade of grass and piece of street furniture. He's entirely manageable, with treats and an occasional 'stop, sit, look at me, now let's walk nicely...' reminder, UNTIL he realises we're on the route home, then he puts his shoulder into the WYDWL harness and determinedly hauls me along, there is absolutely no stopping him once he starts. In this mode, the WYDWL harness causes him to have a slightly diagonal gait, like a dressage horse! He behaves the same with the Perfect Fit harness, but is able to go in a straight line with that one, and bounds along like Roobarb.