If you're going to use a Lee pot, use the right one. It can be tricky to keep your plastic right in a plastic pot, putting plastic in a lead pot is a recipe for disaster. If I remember correctly from discussing the differences with the folks at Lee, the main differences are a plastic pot has a 220v lead pot coil running at 110v, the crucible is spaced farther from the stand (less heat on the thermostat) and has a modified thermostat.