These are fantastic! It takes a few tries to get the hang of it, but I finally got it down. I have really oily skin, so I use alcohol swabs on my nose before applying these. Either way, make sure your skin is CLEAN before putting these on!
They are also a bit big for me, but it is easy to cut them up to fit your face. I like that they are easy to stick on. The magnets work really well on these. Since I have oblong nose holes, I use reusable 'cotton' swabs to round out my nose, making an optimal hole size when putting these on. They stay on all night for me, and I need to peel them off in the morning.
The only downside for me is that, as they are a one-time-use item, they generate considerable waste when used every night. But for me, getting a good night's sleep is well worth it! With any luck, perhaps their next iteration will be more environmentally friendly!