Generally Yandy is a decent product since you get what you pay for. It's not high end but it's functional and enjoyable. I've had no problems with sizing, fit, or shipping times.
I've placed 4 orders with them and only ever had one problem with an order. Unfortunately this one problem has been quite a headache. I ordered one type of panty (the one on the tag in my picture) and received a completely different panty.
When I immediately contacted customer service via their contact form to get a refund (since I didn't get what I ordered) they sent the issue to three different teams. The last team told me that the panty I ordered (the one on the tag in my picture) is exactly what I received when that's literally not true. And yes, I provided the exact same pictures to them. They apparently have no reading comprehension skills and don't look at the pictures they demanded I provide.
Fortunately, I called and the service rep understood the problem better and refunded me. But the runaround I got with the email-based customer service is enough to make me wary about placing orders in the future.