Ebay is totally different fom other ecommerce business.ebay pull together so many small and large shopping store who want to sell there product onlone.at ebay for one product there are so any seller.
Before buy any product fom ebay forst we have to ensure rating of particular store owner.if rating is high then purchage.but 95% chance is you get 100% satisfaction.product delivery is a little bit delay.if you want fast delivery then you have to do one thing.first place order and after 2 and 3 hrs call seller direclty.so that seller get conformation from buyer and he deliver the product soon.i always do same.thats why I never face problem while shopping with ebay.i recommand you must go for it.