I've used inertia and collet type and prefer the inertia. The collet type I have damages the bullets more than I like. I just broke my second RCBS inertia puller so bought a Frankford Arsenal. It's too small for SAUM cases so had to exchange it for another RCBS. It looks like I'm getting about 20 years out of the RCBS units before the plastic fatigues and breaks. I can live with that - this new one should be my last one unless I'm still doing this into my 80's grin