As a parent of a newly licensed teen driver, I was immediately drawn to these bright yellow magnets. The high-visibility design with bold black text definitely stands out – no one can miss that 'NEW DRIVER' warning on my car's bumper.

The magnets adhered solidly to my metal trunk (thankfully not aluminum!), surviving highway speeds and car washes. I appreciated how easily they could be removed and repositioned when switching between our family vehicles.

However, after two months of continuous use, I noticed the print starting to bubble slightly at the edges. While still readable, it's clear these aren't designed for permanent outdoor exposure. The magnetic strength is decent but not exceptional – they stay put during normal driving but might not withstand someone intentionally trying to remove them.

An unexpected benefit? Other drivers actually do give you more space when they see these. I've witnessed several cars maintaining extra following distance or being more patient at intersections. That said, the police warning mentioned in reviews gave me pause – we now remove them when parking in unfamiliar areas.

Ultimately, these serve their purpose well if you have a magnetic-compatible vehicle and don't expect them to last forever. Just remember they're more of a temporary courtesy alert than a permanent safety solution.