Yes, you can reliably save, clone and recall FX setting using FX chains. The only limitation that I know of the the inability to dock effects from inside an FX chain. Not sure if that is by design or a byproduct of having the effects encapsulated in the FX Chain wrapper.
The B patch (if there is one) is going to have people reporting issues too. I have never seen a SONAR patch that did not have people reporting issues. There are a few reported successes but problems are reported with way more frequency than successes. In any event, you have to do what feels right to you.