Gears on the solo are silky smooth. I have had it for about 5 years. Ran well over 1800 lbs of WR and just about every other seed thru it. I have ran fertilizer, gypsum and salt thru it. Most of that after running it over with the tractor. I lost the lid, spread in rain, and still use it even with the big crack on the right side. I have a 500 lb 3-point broadcast spreader but like to spread all my seed by hand. I believe it says it holds 20 pounds of seed. Sure doesn’t seem like it. I wanted a bigger spreader so I bought the 3100 this year. I have not used it yet stated 40 lbs of seed but again it sure doesn’t seem like it. The first thing I noticed is the strap is cheap feeling but we will see. I’ll still use my solo that thing has been a rock but for larger seedings of WR I’ll probably use the 3100. Depending on what how you use it you will not be sorry if you go solo unless filling up the hopper bothers you.
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