For me, I started with Myntra & Jabong (garments, shoes) 7 years ago.
Then lots of mobiles & garments from Paytm.
Few electronics from Snapdeal, Infibeam and Shopclues.
Now, I order almost everything online (mostly Amazon & Flipkart, groceries and few garments from Paytm).
In last 2 years, I have ordered at least 60 mobiles from Amazon & Flipkart (not a single one was problematic).
Also spent at least 10-12 lacs in 2 years cumulatively.