These are a great expression pedal. I have two, and use them to control a Strymon Timeline and BigSky respectively, and they work very well. The one issue that I would note is that the pedal sweep isn't linear, but seems to have a logarithmic sweep in my experience. This isn't much of a hindrance in terms of its functionality for me, but is something to be aware of. I note that my experience is in contrast to that of some other reviewers, so your experience may vary.
The pedal is made of plastic, which is a statement that would often strike fear into gigging guitarists with heavy feet. However, this plastic is very strong and sturdy, and has stood up to a good amount of use with no signs of wear, or cracks. All in all, I have found them to be very hard-wearing, and so the plastic shouldn't be a turn-off.
The cable is hard-wired to the pedal, which is handy so long as it is long enough for your purposes. I have had mine on a pedalboard for some time now, but from memory the cable is about 1m long.