I've used some fake RaceDots (forget the name, but they are basically the same.)
My take is this: they are OK but can be a pain to get on. And I mean a real pain, not just the minor adjustments you have to make with safety pins.
If you have your number ahead of time and can get it put on the night before, use them, so not a problem for Disney races.
If you get your number on race day, like local events, and are going to be putting the number on in your car or a restroom or on the ground, use safety pins.
The other thing to consider is how much do the pin holes bother you? My racing shirts are racing shirts (and cheap ones at that), so a few pin holes and rust stains don't bother me too much.
They weight is
not noticeable, but it bothers me mentally. What's the physics equation? Work = force times distance? Then I think the RaceDots increase my mass, meaning I need more force to accelerate? My physics may be questionable, but I'm pretty sure it takes more of
something to move the extra weight/mass down the course.
But I'm the kind of guy that tries to find the smallest safety pins for the same reason.
