I've been gigging with a Morley Tremonti Power Wah for a while now, and here's my take:
Morley pros:
-The spring loaded switchless design is just awesome! I don't want to worry about clicking on and off my wah for leads and certain riffs when I need to focus on playing. I can't multitask!

(FWIW, Dunlop will mod any of their wahs with this design)
-The wah sweep/range on the Morleys is dialed in to really scream and have your playing be heard! It has a very wide and midrange focused sweet spot, while many of the Dunlop wahs seem to go from closed to open with no middle sweet spot. The Morleys are very vocal and expressive.
Cons:
-Build quality. I've said in the past that my Morley has held up well, but after a bit more time with it, I'm finding that they definitely cut corners on quality. The rubber tread/foot grip stuff actually melted off one hot day at an outdoor gig, leaving a gross sticky residue all over my pedal.

Had to super glue it back on. The rubber feet on the bottom did the same thing.
Also, this past weekend at a gig, the pedal started cutting in and out during soundcheck. Turned out the 9-volt battery connectors had started separating and were not touching the battery contacts.
-Morley sounds like shit on clean sounds. Because of the sweep range and because it is voiced to get a lot of high-end scream on leads, it sounds very cardboardy and flat/harsh on cleans. The Dunlop sounds MUCH more natural and balanced.
Keep in mind that I baby my gear and haven't had these problems with hardly any other pedals. My next wah will not be a Morley.