Been away a bit and just ran across this thread. I’m an autoDOD user and found the discussion on the ID/OD equipment incomplete. I may be incorrect but I got the feeling (reading between the lines) that most of the negative comments come from folks who have hands on experience with the IDOD. I don’t know which negative comments come from this particular group but the posters would know. I would like to suggest that comparing the IDOD to the OP’s autoDOD might be misleading. Yes they are essentially the same machine, but the product produced from the auto DOD, IMO is a huge step up from the manually operated IDOD. The powered feed on the autoDOD produces the same machining on each case, case after case. There are no manually induced variations in case cutting and the motor driven case feed generates an ID neck surface that is not significantly more rough than a good carbon deposit. If bullet or neck lube is in your seating protocol, the very minimal roughness of the ID surface is a non issue.
Relative to initial neck concentricity, the instructions that are issued with the autoDOD are explicit regarding how concentric necks must be to be used with the equipment. I have yet (recently) to find any high quality new brass that doesn’t fall within the specified range. If those new necks are off a tiny bit before turning, they won’t be after.
As with any equipment, it is only appropriate to judge the quality of what it does within its stated limitations.
There are problems with the autoDOD or IDOD that have not been discussed on this thread. Number one they are not the same animal. Further, if you are not removing 2 thousandths or more thickness from your necks, don’t use it - period. The mandrel turners will do a better job in that situation. Secondly, you can only use the ID/OD turning method once on your brass. Brass that has been once turned, cycled many times, and needs to be freshened with another turn to get back to the desired neck wall thickness, are not amenable to the ID/OD approach. They need to be freshened on a mandrel turner.
Bottom line, the IDOD/autoDOD equipment has some very specific requirements that limit its broad application to neck turning. So why would anyone spend that kind of money to buy one? You only have to use an autoDOD once to answer that question. When you stay within the equipments limitations, it is effortless. When was the last time you connected that word with turning necks? And by the way effortless is not a term I would apply the the IDOD, only the autoDOD. It is not only effortless, the quality of the turn is superb. With 500 virgin unturned cases sitting on your bench, the autoDOD is your best friend for the first turn. 20-30 seconds per case and a great result will put a smile on your face. So to sum this up, the autoDOD is expensive, it has limited application, and it’s only appropriate for a select few reloaders - IMO. To put in a little plug here - when not using the autoDOD, I’m real pleased with the result I get with the XXI Century lathe equipment.