TransX

This is not a general-purpose transient designer, and not nearly as useful for drums as the transient shaper bundled with Superior Drummer. In fact, I've found few uses for Trans-X even though I've tried it on just about everything from percussion to bass to acoustic guitars to full mixes.

Looks like I have to try out the demo then. ;-) 

Is there a "holy grail" of transient shapers out there? 

SPL Transient Designer

Seems to be the general consensus. 200 bucks, though.

On vocals...especially mine...I use the multi band version I find that experimenting with sharpening and...er....loosening the transients in different frequency ranges can push or recede the vocal in the mix where it sits just right. For my own voice hardening the bass transients and softening my upper mids works great. The same can be said for strummed acoustics. On shaper attack type keys I use the wide version in a more traditional way to simply harden or soften the initial transients. I also have the SPL (and others) and in many situations they perform better. But what TransX does is unique and when you need it...you need it. YMMV.

I've used Trans-X on picked steel-string acoustic guitar to soften transients. That's the only application I can think of where it was more effective than other tools.

It's frankly never occurred to me to use it on vocals, as transients aren't usually a problem with vox. But then I don't think of Trans-X as a creative tool but as a corrective aid. You've given me something new to try, ol' pal!