I bought this for turning pages while performing on piano. I've used it in a few live situations now and it's performed its task flawlessly. Although it's all plastic, it seems very ruggedly constructed. I haven't had any problems with double-turns.
It's easy to set up and you only have to do it once. There are plenty of options (just search for the online manual), but the default ones suit me when using ForScore with an iPad. I considered the more expensive Airturn, but I think this is a better product and am very pleased with it.
The only improvement I could suggest would be an adjustment in sensitivity, so that you could leave your foot on it, then just press hard to change page. At present, you have to take your foot off completely when not turning pages, which is something of a distraction. However, it does have sockets for alternative switches, so you could always get a heavier switch if desired. It doesn't trouble me enough to consider this, and I like its self-contained nature.