I have bought a lot from AliEx, mainly watches, watch straps, tools, it's pretty good for them & certain electrical items.
If you plan on buying footwear or clothing though, not sure I would, it's always better to look at a shoe instore, try it on.
Also the Asian sizing will be way out, smaller.
A few tips though, always check the Shop/Store's % feedback rating, always look for plenty of customer reviews/photos of the product, download the AliEx App it is easier to use than the website & yes it is safe.