There are good rim squeezers and not so good rim squeezers. My 520 came with Single Digit SD-5 brakes and for years I put up with noise and poor performance. On a steep downhill I just couldn't stop by braking from the hoods, I had to reach round to the drops and squeeze like hell. And they were almost impossible to center, I'd use up all the adjustment on one side without it lifting off the rim. Eventually I sprang big bucks $111 for a Single Digit Ultimate as opposed to $17 for a replacement SD-5 on the front. It's like night and day: powerful, modulated braking from the hoods, silent, center perfectly. Everything a vee brake should be. While I was at it I replaced the brake levers with Tektro RH520s I do believe the new levers are a help too i.e. they have better ergonomics.
I've still got the old SD-5 on the rear and it seems plenty adequate so it's staying. I reckon you don't want too powerful braking at the back, locked wheel etc.