I buy a few things in Lazada, all delivered within one week, and all the products are working fine.
I just don't like their courier service, GDex , simply put my order to my neighbor house, and don't even contact me for the deliver time.

So far, i buy IT accessories like logitech keyboard, mouse.
nokia cheap phone, coway water filter have no problem.

Lazada is just a middle man, you have to look at the seller.
When i buy my water filter, the seller is coway malaysia, then only i decide to buy it.

when i buy my logitech stuff, there is showing 3 years local warranty.