Ozzy - as youve had both, have you noticed the steering sharpness/ride any different after changing to GSD3s?
PE2s were excellent in the wet, but the GSD3s are probably THE best wet tyre. In England, perhaps its worth sacrificing a bit of dry grip for extra wet grip?
To be honest I couldn't really comment accurately on the firmness issue, as I have coilovers and I tend to alter the settings now and then, but unofficially I think the GSD3 is a slightly more comfortable ride, the turn-in seems accurate and the wet weather performance is superb they still feel confident under wet conditions, where as the PE2's used to hydroplane, skip up, and get light on the steering.
I'ts certainly one of the better 'all-rounder' tyres for wet performance as tested by numerous magazines, although Uniroyal make some good purely wet weather performance tyres.
The time of year and the price was what swung it for GSD3's for me, we're got 5+ months of wet weather/bad conditions so I wanted a tyre that was at least competent in the rain (an area I feel PE2's can improve).
The only downfall of GSD3's apparently is because of the softer compound you can expect less miles than you'd get out of the PE2's.
You won't be disappointed mate, and im neutral on this issue.
(P.S The V-Shape tread also looks pretty aggressive compared to the design of asymetrical tyres like PE2's, they look meaner
)