I went ahead and purchased Taket Batpro2 supertweeters to experiment with whether or not there was a benefit using them with my Argos V2s. I've only had them hooked up and playing for about 7 hours, but to my ears in my system and room there seem to be some added body and weight across the frequency range, no brightness or glare, no dulling , maybe a bit more depth. Net net , my initial reaction is that it was a worthwhile investment - roughly $700 including getting a speaker cable
I don't doubt that going for the upgrade to the newer tweeters and mid range is likely more worthwhile, but given Lou mentioning in a different thread that he is pretty booked up I went down this path at least for now