Buying the Pro-Cart AT1 was the best money I've ever spent on a stone tool. Even after 6 years of using it, you'll still hear "have I told you how much I love this cart". You can walk away from it with a big island or peninsula clamped in without worrying about it falling over. The cart is also lightweight but really stiff, so it reinforces the stone against breaking. It has the big pieces setting high enough that they almost load themselves when rolled onto the cabinet. It doesn't seem to matter what surface you’re on, it rolls easily and makes it easy to get up a couple of steps or over low obstacles like thresholds and such. I would recommend this cart to all who install stone slabs.