the common inductor based wah's are very inconsistent from one to the other. a good one is finally tuned or luck of the draw. you'd do better hitting up a boutique drop in kit that is tuned in correctly. like pickup coils, the dc resistance and inductance play a huge part in the sound quality of the inductor. there are other aspects such as transistors and cap materials that play a big part as well. often times these aspects are neglected with big sellers such as dunlop or vox. thus why the luster of a new one wears off quickly. i heard that hendrix, like his strats, went thru 20 or so before finding a good one. so the luck of the draw is set against you from the start.
check out this kit, very well put together with all the makings for nailing a great wah sound out of the box. http://area51tubeaudiodesigns.com/Merch ... ode=cat002
just need a shell and your in business. but if you do go the dunlop route, i'd go where they have a pretty good stock of them and try each and every one out before deciding.
"Tone is in the instruments. Technique in the hands. Do what you will." ~quote from some guy at the TGP forum
"Without a doubt, the quality of your instrument will effect your tone, and any pickups, effects, amps, and microphones used along the way will also have an impact on the sound waves."~Cameron Mizell