Originally Posted by
Steelisreal
Pro: If you want utterly consistent neck tension then this is a big step in the right direction
Con: Spendy.
If you can afford it, buy one. We are lucky here that the range I belong to has one available to members to use. It's so easy to set up for your brass. I had been using the preset programmes, but recently obliterated one of each of the batches of cases I have in the Aztec mode. Now I have customized programmes for every lot.
I haven't done any testing to see if there is any distinct advantage to annealing every single firing. I have relied on reading widely on the internet to convince me it's worthwhile.
It seems (from online research) that annealing won't make your loads more accurate, but it can minimise one variable that can lead to inconsistency.