My $0.02.
Don't let customer service play into this. I have had nothing but fantastic service from Lee, RCBS and Hornady. I can only assume Dillon has fantastic service also, I haven't gotten anything from Dillon. My advise to anyone is if your reloading stuff breaks or doesn't seem to work correctly call the manufacturer. They will often times send you parts or give you knowledge for free!
I originally bought a Lock N Load kit from Hornady just because it was the cheapest kit with almost everything I needed.
I spend most of my rifle reloading time on case prep and very little time on the press, so I don't think it would matter much what press I had. It takes a long time to clean brass, lubricate, knock out primer & Resize, cut down to size, debur, clean out primer pocket, ream out military crimp (if present), measure everything... The actual act of priming, tossing in powder and putting a projectile on top seems to be the least time consuming of all (after the dies and powder throw are setup). So from everything ready and getting 100 to 500 rounds per hour with a progressive, vs. 100 rounds per hour with a single stage just doesn't seem to matter to me. Your mileage may very. I am speeding things up a little over time, I bought a couple of case trimmers from little crow (amazing), and an RCBS case prep center. But, overall the better faster things only save my hands from all the repetitive motions, they don't speed things up radically.
I do 100's of rounds at a time with 250 probably being the most ever in one sitting, all with my little hornady lock n load press. So far, 9 mm, 380 auto, .40 S&W, .223, 300 blackout.