Flail type manure spreader question

I've got a couple regular manure spreader, a new idea 217 and an IH 515(?), and found a barrel type flail spreader a guy is selling cheap. Are they any good? They seem popular in Europe, been checking out YouTube videos.

I like the simplicity, but am curious why they never caught on. They would appear to be messy, but most are anyway.

Ever run one? Do they spread OK? Should I run away?

I hate working on my new idea's chain links/front idlers. I either need to come up with a different design or get rid of it.

For $4-500 I may take the risk.

Here's a video of a similar unit I found on YouTube. https://youtu.be/jtTrRV_WFqY

Thanks.

Flail type manure spreader question