I don't really have a need for a spreader like this.....but I think lot's of others may want one. You should do a product review on it.
For larger broadcast jobs.....I use a Herd GT77 on the front of my UTV. Sometimes I turn a crank on a cheap whirlybird spreader in a tight corner or to fill-in a skipped area. I've got a like-new Solo hanging un-used on the wall for a few years now. If someone want's it for $50 shoot me a PM.
BTW......I bought a cheap ($35) tire inflator that uses cordless drill batteries. I use it in OZ to inflate bike tires, golf cart tires, and car tires. It is the best bang for the buck purchase I have made I a long time. Set the desired pressure.....clip on the tire valve and let it work. Stops when done....perfect PSI. Easy enough for anyone. Tires are always an issue in OZ with the changing temps......this is the real deal.