The problem they're solving
Most kitchen cupboards are basically black holes after 9pm. You know the feeling. You're trying to find something quietly, the overhead light is too harsh to bother with, and you end up knocking three things over. These little magnetic strip lights slot in without any drilling or wiring, charge via USB, and stick up in about thirty seconds flat. For £8.99 you get two of them. That's genuinely not bad.
What's actually good here
The magnetic mount is the bit I'd highlight. No adhesive that gives up after a fortnight, no screws. You can reposition them whenever you like, which matters more than it sounds if your kitchen layout isn't especially logical. The motion sensor works at a reasonable range, the dimming function is a nice touch for night-time use, and 40 LEDs per bar gives decent coverage under a standard cupboard shelf.
Recharging is straightforward. Plug in, wait, done. Battery life will depend on how often you're triggering the sensor, but for occasional use it should last a good while between charges.
Who should probably skip these
If you've got a large kitchen and want serious, consistent illumination, these aren't that. They're ambient helpers, not a lighting overhaul. Also worth knowing: there's no published brand with much history behind them, so long-term support is an unknown.
Honestly though, for the price and the convenience, they're a spot-on solution for a drawer unit, a wardrobe, a utility room shelf. The HotUKDeals community gave them nearly 1,900 heat, which isn't nothing. Worth a punt.