Got a Super Bawl Whine-O. It's ok, and it's got TB. It's also red and heavy, and the dog glows in the dark. Hip! It's a bit bassier than the crybabys, I think. Not as cutting. Although the "shaft" mode w/a strat recorded direct totally nails that cheap '70s porn movie vibe...
For Metallica and GnR stuff I'd go for a Dunlop 535. That's a good modern-sounding wah that doesn't leech tone too much. Or a Teese RMC3, that you can tweak for ages.
If someone wants to sell that Snarling Dogs thing that has a wah and a ring modulator in the same unit just let me know! Wah -> Ring mod -> dirty channel is one of my favourite sounds.
I have a Whine-O+ and it is incredible. I've played a Jem for quite a while, and they go together perfectly. It is one of the older ones that clicks on/off by the pedal, and as far as I know is not true bypass (unlike the newer ones).
Even without true bypass, there is no noticeable effect on tone or volume. I play with a lot of distortion usually, and I find the "white room" (low freq. sweep) and Voodoo (med freq.) to be the most useful. The Shaft setting seems kind of useless to me, even with a clean tone. Its just too high of frequency sweep and not wide enough.
I don't think this pedal is very good at emulating that classic Hendrix vintage crybaby wah sound, or even 70's funk guitar stuff (despite the "voodoo" and "shaft" names). But for more modern styles like metal I've never heard anything like it. You wouldn't believe the sick noises and face-eating solos this pedal can produce!
The only thing I can really criticize the pedal for is reliablility. It's not exactly bulletproof construction, and it can be kind of flaky sometimes unless you step on it really hard. Granted I have an older model, but occasionally it will sort of cut out a bit, a disaster in a live situation. Still I would highly recommend it for recording.
I've played lots of different pedals, and whenever I see a wah I haven't heard, I always try it out. I've tried pretty much the whole crybaby line, lots of vintage pedals as well as some REALLY expensive custom wahs, and this is the best thing I have ever played for a heavier style. The only other wah I have ever liked as much as my Snarling Dogs was a 60's Vox/Crybaby. Metallica and GnR? Hell Yeah!!!!!