Lead Foot LFX-1

It does the job.. but get a better one..

A cheap solution to those not wanting to spend much on an expression pedal.
The build quality is what you'd expect, plastic, and not able to switch out the cable.
It works extremely well in most cases, though it does give the feel that it reaches its maximum value too early.
If you're looking for a cheap solution then it's definitely a good choice, but I would recommend spending a little more money on something a little more consistent

I use this thing with my Voodoolabs GCP and also direct into the Kemper. It works great and if it breaks, who cares. The only issue I had with it was when I had it set for the wah to be bypassed when the pedal stops moving, and we played on a big stage, the bass was shaking the floor and the wah couldn't turn off. I did half the show with a cocked wah...
Also, if your doing pitch effects, its a little inconsistent with the heel and toe being 0 and 100, sometimes its a little under or over.

This pedal is okay for the price, but I've found the tracking to be a bit dodgy at times. Also not a great feel to the pedal, if I was using this a lot I would recommend spending a bit more money.

Lack some precision and it doesn't look very well built. But hey, for this money I don't know if you can find something that actually works. Plug and play :)

If you want a cost effective control pedal I would recommend this however there is one major issue -
The pedal offers almost no resistance to being moved so subtle changes are difficult, and putting your foot on the pedal with it is mid travel almost impossible without moving the pedal. The bolt which holds the 2 parts together can't easily be adjusted to add more resistance.
If this isn't a concern for your intended use then grab it, otherwise look at some of the more expensive offerings.