Like most pedals, this was really easy to get going. I simply plugged my guitar into the input and sent the output to an amp. The effect is a standard wah/filter sound and while this model could have a greater sweep range, it definitely gets the job done. I have never seen the model because I bought it used.
The effect with this Dunlop is very realistic and usable as a wah sound. I used it with guitar mostly, but it would certainly work with bass, keys, or any other instrument you could plug this into. While it isn't a versatile pedal, it does exactly what it advertises - gives you a good sounding wah-wah at a reasonable price.
I've had mine for about 6 years now and although I don't use it all the time, it is my only wah-wah pedal and use it whenever I want the effect. It is real basic to use and has an on/off switch to toggle with when you press down the front of the pedal with your toes. I've used some other Dunlop models and Vox models and while I like some of the other wah-wah pedals better, for the price I really can't complain. It gives you a nice sounding wah for a fraction of the price of some of the more expensive models.