I really can't say anything bad at all about Aliexpress or Banggood.
I don't think I've ordered from Bangood in years (if ever? I don't even remember anymore)
I have a few gripes with Aliexpress, but I've never lost money on a transaction. You do get a refund if things go sideways, but that's not the only place for issues.
My gripes:
Their misleading search where sellers can get an item to show up for an unreasonably low price by having different "color" options that are actually completely different products at completely different price points, but the search results show the cheapest price for the most expensive item of the available choices, and it makes the search results entirely useless and a nightmare to find a good price.
You search for: diamond ring
Search results: diamond ring - $0.05 (where the diamond ring is of the color "we send you a printed picture of a diamond ring on a piece of paper - $0.05" - the actual diamond ring is $1000, but the search doesn't show that (entirely contrived example, but you get the picture). Once one seller starts doing that, they all do, and now you can't find an actual price in the search at all - you have to dig through 15 or 20 different sellers and open up each product page and choose the right "color" option to find the actual item, and then compare the prices by hand in multiple tabs.
Unpredictable / Slow / expensive shipping, and useless search results related to that:
Some items ship free and show up in 5 days
Some items ship free and show up in 5 months
Some items shipping cost is more than the item, but it shows up in 5 days
Some items shipping cost is more than the item, and it shows up in 5 months
There's absolutely no consistency, and no real way to tell beforehand which way it's going to go. It's a total crapshoot. At some point, if it said "e-packet" shipping, it actually meant "e-packet shipping" which is pretty fast, but now everyone just lists all the shipping as "e-packet" and then sends it by slow boat anyway.
The search itself:
Search AliExpress right now for ZT703S - there's only one listing for an actual ZT703S (whether that listing is legit or not I guess is up for debate), but it will return hundreds of results that aren't that item at all. Search Amazon, and it returns 2 listings, for expensive pocket knives. Search ebay for ZT703S, and it returns "0 results". AliExpress search is like Facebook Marketplace search - useless, but it will fill the results with "pages of something" just to waste your time / keep you on the site.
Pricing (more recently):
Most sellers on AliExpress have jacked their prices way up to the point where a lot of stuff I look at now is cheaper on Amazon than it is on AliExpress, and I know I'll get it in a day or 2 from Amazon (along with a less painful return process), and combined with the other issues (especially the misleading pricing in the search), why even bother with AliExpress anymore. Amazon (or 3rd party sellers on Amazon) used to not carry a lot of stuff you could find on AliExpress, but now almost everything that's on AliExpress can also be found on Amazon now. And a lot of it can be found on EBay too. Ebay is usually cheaper for the same item (because you're not paying the Bezos tax, you're paying ebay tax which is a little less).
AliExpress USED to be really good and really cheap, even if the shipping times were all over the map. Now it's just Chinese Amazon with worse search, worse prices, and worse shipping!
That said, I still do order some stuff from AliExpress - when I really don't care about how long it will take to get to me, and I care more about saving $0.50 overall. But it's a lot less than it used to be.