I've been on the seamless underwear train for a few years now (love not having to wear thongs as often!), and have tried a lot of different brands and styles. These are the best I've tried so far because the gusset is actually sewn down! Every other brand I've used has the gusset glued down, which really shortens the underwear's useful life. These should last a reasonable amount of time.

When getting these, I recommend always ordering a size up. Not because the sizing is incorrect, but because if this underwear bites into your skin at all, it defeats the purpose of seamless underwear. Because of the material, one size bigger likely won't be too loose.

The vendor also offers a great return policy!