I think the BIAB VST is more advertised than used.
It was because I saw the BIAB VST plug-in that I started to pay attention to BIAB again.
I'm in the same boat. I had a trial version over 15 years ago but decided then the software wasn't quite there yet.
Ran across a good sale recently and grabbed the UltraPak+. Unfortunately I can't run any of the stand-alone versions as they do not allow me to choose my ASIO driver (RME Fireface) or it just crashes.
The VST3 plugin has not crashed on me even though it has exhibit a host of other issues (no audio from the plugin seems to be working e.g.).
I still have a few weeks to evaluate the software and frankly, I'm on the fence.