[folivier]

I had Zipdee on my '93 and hardly ever extended it especially if there was any chance of gusty winds. Too difficult to retract in gusts.
My '98 has the Girard and we use it very often. So nice to open it fully or just partially and not worry about the wind gusts with the auto-retract feature.
It does come down to the cost difference but to me I would pay it for the convenience since it would get used more often.