I think you will be happy with an SDB and there are some good deals on CL and some on Ebay if you want used.
I bought three SDB's with boxes of parts, tool heads, dies and plates, put one together and sold it and the spare dies and paid for the whole lot <<< so FREE
I am not into high volume rifle shooter and if I was, I would not touch the the 550 and go straight to the 650.
One SDB is set up for small primers for 380 and 9mm and the other large primers for 10mm.
In my opinion, there is no real need to send a SDB back to Dillon, buy a small parts kit and replace the parts and be back in business in a few hours.
