I have had mine for 4-5 months. I noticed lower SD's on my MK 262 clone I worked up. I figured if I wanted any kind of respectable brass life out of a load that hot I would need to anneal.
Make sure you get some Tempilaq and some sacrificial brass. I try to set my machine up so the brass drops into the lower wheel as the Tempilaq is changing. Probably gives it .5-1 sec extra in the flame but it is very consistent.