This may be the wrong place to ask but:
- Are these just for racing bikes? Is it dumb for a commuter?
- Are these easy to remove if you sell your bike eventually?
- Are they a theft deterrent? (I would use a scarier name; Knuckles McGurk)
- Flag aside, will people judge you? (e.g. insinuating to have a competitive streak, then race you?)
- They ask you to specify a flag... Can they use any emoji?
I've got these on all my bikes and have a stash in a cupboard for n+1 moments Clearly therefore I'm slightly biased but IMO:
- Not just for racing bikes, I've got them on both commuters
- Easy to remove
- I doubt they're a theft deterrent
- I suspect I'm judged many times daily but who cares, you only live once
- I think on the web page it has to be a flag but call and ask them - I'm sure they can customise them further