I buy stuff there 2-3 times a week. The big sales they have at different times of the year are worth racking up coins for, and then cashing them in with coupons and any cashback credit card. A business account also gives 3 percent additional on orders over $100. If you have tax certificate for a business, you register that with Alibaba and then it shows up in Aliexpress. They exempt U.S. businesses now too (started last year).
Avoid a few things like any storage, USB sticks are almost always over-formatted and unreliable. Also nothing there is U.L. listed as far as power cords, etc. The support is good, only hindrance is translation sometimes. Send them plenty of screenshots and they usually see what you're talking about when explaining something.
I have some things coming in this week from the Summer Sale:
SMSL H400 for $354
SMSL DL100 for $152
Thieaudio Ghost for $49
Plus the 3 percent cash back for the Aliexpress business account, then another 3 percent PayPal cash back (also doubles warranty via MasterCard program). Capitol One usually has a 4 percent cash back for Aliexpress, but you have to log into their web site to activate it. Plan out the sales with a calendar and the prices are close to wholesale or used (but with a doubled warranty).
I use this to keep track of them:
AliExpress Sale Dates 2024 Upcoming Sales on AliExpress, Date, Event Calendar, Offers in 2024 Today's Deals, Amazing discounts
promossale.com
I had to return a few things and it was easy, they provided a return label. Twice I got the wrong cable or adapter, but the item was like $1.03 so the automatic system said no return needed. I use PayPal and never had a billing problem. If you're really cautious and have a Capitol One card, use the Emo browser addon they offer. This lets you create a temporary card number, and even lock it afterwards so it can't be used after purchase for anything else.
I don't use the phone app anymore except on a phone I never use. Battery consumption was 18% on it and I've heard from others that they were talking about something very specific near their phone, and when they opened the Aliexpress app the suggested items were what they were talking about. They said he never searched for those items before, and it was on the front page of the app when he launched it. I'm just really wary about it, others reported massive data usage from the app also. My case was with Android set to not let it use the battery in the background, and permissions turned down to the minimum and it still was blowing through battery life.
Prices can't be beat if you don't need it in a hurry. Also they have stuff Amazon doesn't. My favorite is the neon LED signs I got, and also Hifiman HE5xx/Deva pads and Topping L30/II Amp power supply which aren't available anywhere else. I just go with Amazon if it's a rush for something, USB sticks, U.L. listed extension cord, that kind of thing. Build up the coins and time a purchase with their seasonal big sales to really stack the discounts.