Are iFixit parts equivalent to Apple original quality?

Vijay - You raise a good question here on where the parts come from from all of these online sites.

So lets break them up into groups so you can see better what you are dealing with:

• People who are authorized repair centers which buy the parts from Apple and then turn around and sell them on the open market. Often these folks are clearing out excess inventory as Apple does not take unused parts back.
• People who strip down equipment new as well as used. So again you are getting real Apple parts just used. As long as the the device was not damaged in some way these parts should be just fine.
• People who locate the supplier of the given part to Apple and resell the part on the open market. On the most part this is under the table selling as the vendor is not suppose to sell the parts to anyone. Often these parts are slightly imperfect visually or could be out of specification. So you do need to be careful here.
• Last group, These are the knock off's the market for Apple parts is large enough to make it economical to mimic the part. As an example today you could buy in China an iPhone 6! Yes, I did say 6. Here's a writeup on it: iPhone 6 knock-off. The amount of effort to emulate the look of iOS with the Android OS even though the apps are all Android still surprises me. If I didn't know better I would think it was a real iPhone 6. This is the group you should think about buying from a middle man who does the work of qualifying the parts to make sure they work. I would be careful buying these parts off of a fly by night outfit (Here today gone tomorrow) could cost you.

So there you have it a rundown of the market now the tough part can you tell who is who? Don't always look at the cost of the part think about were the part is likely have come from and who is selling it. I'm not saying not to gamble, just do so with the small stuff first with a given vendor so you can feel them out before buying anything large and expensive.

IFIXT has been around a long time so that should count for something. They also strip new systems down for parts so you will often find the description tells you if the part is new or not. They have done a good job qualifying the parts and if you encounter a problem they do take the part back and are willing to refund you or get you a replacement.

Just to be clear I have no affiliation or financial relationship with them other than being a volunteer answering questions in this forum.

Hope that helps - Good luck!