I heard majority of people have gotten issues with Techfast and received poor customer service.
I would love to hear some personal experience buying and dealing with Techfast if possible.
Is it wise to buy from Techfast or should I try a different supplier?
I think you'll find most people have good experiences. It's just the negative experiences that are posted. Their deals are popular for a reason.
Personally I had a good experience. They shipped the parts separate at my request and they all arrived within a fortnight. All parts worked fine and I haven't had an issue.
That being said, my friend got a similar PC but pre-built by TechFast. He said one of the fans' molex connector was a bit broken so it seems like they may have been a bit too hasty plugging it in.