Is there anyone who has used/ is using Hyros to track their conversions? If so, is it worth it in your opinion and why?

It depends- what you are looking for and how much are you spending? It is really nice to get better attribution for your ads and I think Hyros' model is more accurate than FBs, but it's not actively being developed anymore, so I'm not sure how long it will stay that way. There's another company called voxlanalytics that's in beta right now that has a pretty decent alternative