U.S. Comrades: Thoughts on FRSO?

I've been trying to find an organization to get involved in but a lot of the bigger Leftist orgs in America have some kind of controversy related to them and that's a bit off-putting.

Freedom Road Socialist Organization is the only one I've heard of that doesn't appear to have any stains on it and that's piqued my interest. Does anyone have any experience with them? Are they a good org?