I've used the RCBS rock chucker for 15 years now and haven't had one problem with it. Still works like new. However, I did have to take it apart and clean it this year for the first time because it was getting hard to operate in the cold (30 degrees and below). It was just gunked up with old lube and it was easily fixed
. It is hard to beat RCBS' customer service too. Side note: the co-ax looks pretty cool and I'll get one as soon as I wear out my rock chucker