I left mine on for international travel through LHR to MUC and return. No problems.
Left them on as an experiment to see how they held up, and no damage to report..
Just show them off on your carryon like people seem want to do, as if PS is something to flaunt
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Be careful with leaving them on when you're not using them as there have been reports that sometimes the tags have caused bags to be misrouted when landing in SYD or any other airport that uses the RFID tags. The RFID will also be readable through the bag, so just putting them in the top pocket of the bag may not prevent this from happening.
QF may have resolved this issue - I don't know. But something to be aware of.
.When I qualify for WP and eventually get my WP tags - do I also get the old style tags as well? Or do you only get the new QTags instead?