My experience is very much buyer beware and seller beware.
If buying focus on ‘New with Tags’ or ‘New without Tags’ or accept that ‘Very Good’ can mean a multitude of conditions. Check the pictures carefully and check the seller reviews.
I also rarely spend more on an item than I am willing to lose.
My buying experiences have been generally quite good, although I have had a few fit issues and had to resell things that were too big or too small.
I have only had one serious purchase issue where the seller sent me a totally different item to the one I bought. That issue is ongoing and I am waiting for a resolution. However, I suspect from her other reviews she has made a genuine mistake and it will be resolved.
When selling I consider all aspects of the buyer profile before accepting an offer. I try only to sell to buyers with good reviews. Obviously that approach doesn't work if someone pays full asking price, but few people do.
Once sold, I package immediately and well, put the parcel straight in the post and communicate all the way through the post sale process.
I have bought and sold dozens of items and been genuinely delighted with many of those transactions.
What is not so good is the customer service if you have a problem. Trying to get Vinted to accept some genuine Converse trainers I sold as the real thing, resolving shipping issues and actually getting Vinted to send me the excess account balance I was holding at one time, have all been real tear your hair out moments.
I hope you enjoy your Vinted experiences