As most of the items I've purchased from this site are so cheap, I would label a Bad only those that are unusable. In most cases, this just means that you threw some Euros away. In one case though, the product was unsafely bad. So here we go:

Floral Nail Stickers
I've bought these for €1.8 for a bundle of 30. First, they are very difficult to use. They are almost impossible to handle, take them off the plastic sheet and place them on the nails. I've even tried to do that as water decals, but that also didn't work. And when I finally managed to take one without destroying it and put it on the nail, I would seal it with topcoat, and in 20 minutes it would be gone.
Very frustrating.


Striping Tape
I've bought a bundle of 30 for less than a Euro. They are usable for nailart where you actually place them, paint over them and then remove them, but when I tried to use them as part of the decoration they kept curling up and after some time there were gone! I used them with and without a top coat, still they would be gone in a matter of minutes. Afterwards I bought some more expensice striping tapes from Ebay, and I didn't have this problem.


Elite 99 One-Step Gel Polish
When I saw that Elite 99 released a new one-step line I was glad, as the time spent on my nails would be much shorter. But then the products came. One, the smell is HORRIBLE. Two, the bottles don't close properly, so they would leak near the cup and the bottle would be sticky. Three, the mani would last for maybe 5-7 days, and then the polish would come out whole, like a sticker. Four, and most worrisome of all, I noticed that after using the One-Step polish, the skin under my nails would get burnt and actually fuse with my nails. After a while, this got very painful. So this is the one product I urge you to STAY AWAY FROM.