what are the thoughts of stand alone super tweeter

Best to have one custom matched to your loudspeaker.

1 of the problems with super tweeters is they are designed to work with many loudspeakers so thus they never are fully matched or fully integrated to any unless you get lucky. Best to DIY or have one custom built to match your loudspeakers. You wouldn't just use any tweeter and crossover type if you needed to replace tweeters in your loudspeakers you would contact manufacturer or find best match to the speaker, but with super tweeters you just buy a one for all design? this not optimal at all. At least with subwoofers they have own amplifiers and fully adjustable networks but with commercial super tweeters your lucky to get a switch to adjust 2 setting or a cheap pentameter to match levels.Most don't even offer this. And if ST is properly designed for your loudspeaker you shouldn't need anything to adjust, level or crossover.Just move ST forward and back to set up time alignment.

Shadorne, Does seem most loudspeaker purchasers have no clue about the transducers crossovers etc used. And most manufacturers keep a tight lip so no wonder this is so. With so many loudspeakers with a few $100 in electric parts selling for over $10000. No wonder so many gear churners in this hobbie. So maybe if loudspeakers used better quality parts and designs folks wouldn't feel such a need for add ons, tweaks or constant change to keep ones attention on the music not on the system.