I am buying two new Goldline ACW's. We are in a windy, dusty environment and the push in CC readers build up crud. Hamilton said the slide readers are only available in the retrofit kits. I priced them both ways, with CC package and without. It was actually cheaper to buy an ACW w/o the CC option and then add the retrofit. That is the only way to get the slider type. Are there any known disadvantages to the slider type opposed to the push in type?