HALion 5 is very stable too guys and gals. Don’t be afraid, that just because this is a new version, that it will be buggy, cause it isn’t. I can’t say its perfect, but personally, it is just as stable as HALion 4 and has presented zero issues. When loading projects that were done with HALion 4, HALion 5 loads in its place seamlessly and without notice. This is unlike Kontakt, where each version acts as a new plugin, being for a real pain in the ass. All the new features work in tandem with what HALion 4 offered and the extremely familiar GUI we are all used to has remained 100% intact. There is a very slight font/knob look change, but being so minor, you may not notice, or will quickly forget.
As JMCecil mentioned, there will always be additions and changes to be had and we can’t all be happy all the time, but being a 5.0 release, it offers tons of stuff that we never thought of and filled in a good few gaps from things we did request since HALion 4. In future updates, I am sure there is lots more to come. For the upgrade price from HALion 4 to 5, it is a no brainer!