I normally don't give two ***** about bypass. Most of it is OCD BS. I had an old DOD analog delay for a minute, however, and that pedal had the absolute worst bypass I've ever experienced. it had a great delay sound, MN3005 chip and all, but the base tone, and the bypassed tone were so dark and muffled it was like I had rolled my tone knob all the way off. Ridiculous pedal, as a result.
I've had several of the fx series. The bypass isn't bad on those but I had a couple that were noisy even with the effect disengaged. If you get a quiet one, run it in a loop or after a good buffer and you should be fine.
They are very cheap and easy to change though. I bought 10 of these momentary switches off of ebay for $2 w/ free shipping. The new ones had a nice audible "click" to them as well.The crapy switches were the weak spot on these
That would only be possible if the audience could compare your signal chain with then without the pedalI've yet to have anyone at a gig tell me my tone was too colored by a disengaged pedal