I mostly sell on Mercari and rarely buy. I don't sell anything with real value because I'm terrified based on reviews to get scammed. My biggest issues are really the changes to the app in the last year or so. First, shipping keeps getting higher and higher, which I know isn't completely their fault but other platforms I sell on haven't gone up this much. They make you pay 2$ to withdraw money if you have less than 10$, which sucks because I've been selling considerably less over the past year and don't always know how long it will take me to get to 10$. They now make your items inactive after a ridiculously short amount of time, and it takes extra work to activate them again (especially if you have a lot). It's near impossible to get a hold of someone with the company. I do like how they now automatically rate you if your buyer didn't within 3 days, so that is good. I'm giving it a 3 because I've never had any major issues but over time this service seems to have progressively gotten worse and harder to sell on instead of better.