The car moves around less on pins, you'll have a bit less steering with pins all round too. Normally you get understeer on spikes and oversteer on pins, but Teeside seems to be the opposite for some reason.
You will defenately need the blue rear springs on pins, they will give you back the steering you lose going to pins and stop the rear suspention colapsing and making the car unstable.
I find the pins actually wear slower than spikes as you're not drifting about all the time.
You will have to be awake to drive the car on pins though, it should be well balanced but grip roll will be a problem on that evil green astro for the first couple of runs on the tires.
If you keep your head for the full 5 minutes though pins are worth half a second a lap easy
