I have two Polytunes, a HOF, Corona Corus, and a Sentry Noise gate. I've never had a problem. However, I've read the horror stories, I think overblown. Some forums make it sound like TC is putting out junk, and these are the same posters who rave about their Joyo and Donners.
I'd guess that most builders use the same switches. In a small enclosure, they might be surface mount. I don't jump on my switches.