I used to work for Johnny Sides. That spreader is something I am intimately familiar with.
From the point of view of a customer, Sides is a fantastic company.
From a product standpoint, you will NOT find a better spreader. Period. Selling them to people was almost an afterthought. Sides does commercial grass seeding and the whole thing began with trying to get a seeder that would live up to the demand they have for their own operations. The bottom line is that you are looking at the absolute Cadillac of spreaders. It will not wear out on you. It will not break. It will not disappoint you on performance.
I can not recommend this spreader heavily enough... Expect the price to match the fact that these are the nicest spreaders available.