Stand Alone Super Tweeter for Revel F208?

Update- I bought a pair of Taket Batpure super tweeters. I wasn't even sure if they were working. I would try with and without and it seemed sometimes I could tell a difference and other times not. I have had them connected now for a couple of weeks and decided to disconnect them last night. Everything seemed flat and lifeless without them. If you connect these things by themselves you can't even hear them!

I have read through this thread,  overall, I agree with Erik.  I would do a tow in with these speakers and get a better handle of what you are after... A bit more tilt up of the treble region? 
Better air  & detail around the instruments?
More energy in the treble region.  
You can achieve some improvement in air & detail or maybe a bit more energy in the high frequencies with a simple switchout of a few capacitors with the same value. 

@honashagen -- congratulations, the result you have achieved is exactly what I would have expected -- do you also find that the quality of the bass has improved, with more crispness and tightness to notes? Anyway having lived with STs for over a year now every time I would no be going back