I can only comment about the Hannan, I had it for over 6 months, its very useful for incrementally training my steer's digestive systems to take in more high energy foods to fatten them up for slaughter. it works good for me but do not use whole corn (gets stuck), use cracked corn or small pellets like 14% creep pellets. I hand mix feed and its a whole lot of work but I got fancy cows being feed out for local restaurants. its not good business model for maximum profit but an excellent way too get really good beef on your own table. If you have to pick one type of feed, get the Purina 14 % protein creep pellets at $11 a bag. My feeder runs on a 110v plug (I hate batteries) under a roof in 3 sided barn. more to the story but those are my main points
If I had to do it again, I would position the feeder where some one could fill it in bulk, the bags wear my ass out, soaking wet with sweat and dust when finished, my steers at the same time have access to 40 acres of a variation of good grasses and swim in a spring feed lake every afternoon to cool off, socialize and enjoy life., the feed is costing me $50/head per month
its been a good idea all and all