I have used Temu a lot... and also in part helped out with this website: https://testingtemu.com/
Lots of junk, but also a lot of useful stuff at a low cost, so it depends. The reviews at Temu are mostly junk, lots of them just say "five stars, the package arrived, looks good, but haven't tested yet." Some are realistic, but it is always wise to read some feedback at least before you buy something!