would you rather just deal with 20 841 clusters, each cluster being 20 miners with a single IP address and mining info input?
There is a downside to this way of operation, having 400 individual IPs and most importantly workers gives you the ability to keep track of everything from the pool-side, when I look at the pool status using the app on my phone or a "watch link" even from untrusted device, I can tell if there is a problem with any given miner, so i can call my guy and ask him to reboot miner xxx.
Having 20 miners with the same worker will require a local access in order to troubleshoot the bad unit, also as far as setting up a ton of miners it's no longer an issue with so many programs that will handle that for you in no time, so this isn't really an advantage but rather a disadvantage ( a minor one to be reasonable), however, less network cabling / switches is the only advantage in having clusters of 20 miners.
With that being said and without owning any of these avalon gears, based on your words and the other trusted members, I can tell that they are way more robust than the equivalent of bitmain's S9, the only advantage that S9s have over these gears is the ability to downclock them down to 70w/th, not sure of these Avalon gears can do 70w/th but since he has free power his main focus should be on durability and lifespan which without a doubt favours Avalon 841.
