I have shopped with Flipkart, Snapdeal, Shopclues, Jabong and many more. I would suggest not to stick to any specific site, wherever you find good deals go there cause shipping, product quality for branded products is all the same everywhere only price differs everywhere.
But yes you can get some very awesome deals on this site which are not available on other sites. Do try Outrageous & Jaw Dropping Deals. Sunday Flea market is good but on Sundays site is generally too slow..