FWIW I: A new version of WireTap Pro is in development and beta testing is ongoing. The estimated release date has yet to be announced.
Details. and a venue for your feedback or comments, are available
HereFWIW II: I use WTP and found it to be solid, intuitive, and without fault. The only issue I had is that the "do not call home" preference was difficult for me to find. Of course, I noted that in my feedback (above).
FWIW III: Apparently Audio Hijack gets a bit higher ratings on VersionTracker, in part because it has some capabilities that are lacking in the present version of WTP. Whether these missing features will be in the new version, I dunno, but I suspect they will, especially as they (Ambrosia) claim they will go well beyond feature parity.
HTH