I won't be any better than locally available ones but... It'll surely be much cheaper! When you buy from AliExpress; there's no middle man or perhaps 'men'!
Tell you what; I have been looking for a PSU Tester because my computer power supply is getting old and I want to replace it with a 500-650W used one. So naturally; I went to Hall Road a few days ago but... Most shops didn't have that, and the ones that DO were asking ridiculous amounts (One shop quoted me a price of 3,000). So I opened AliExpress app, searched PSU testers and that's when I found this:
It's the EXACT SAME tester I found on Hall Road; only difference being its price (1,200 vs. 3,000). Now of course; there's a slight chance that it might get stuck at customs but even if they charge me 500 rupees; I'll still save well over 1,000 rupees!
And the same can be said about smartphone accessories and batteries etc. I ordered four pure tempered glass screen protectors for just 450 rupees and their quality is comparable to the ones which are sold here for 150-250 rupees each.
But with that being said; your mileage may vary. AliExpress is a very unpredictable place and is full of both honest and crook sellers. The best precaution is to buy products with lots of positive feedback and 95% or higher seller rating.