Before I start I know some of you may think its morally wrong to buy these knock off clubs. Thats a great opinion to have, and if I had authentic clubs available in my country I would buy exclusively Authentic.
Let me also say that when I lived in the US, I bought authentic clubs, bags, and balls while there and do not condone purchasing knock off items, if it breaks any of your country's laws.
So......
A few years ago, I had the privelege of working in China for a few years, and I became good friends with one of the knock off sellers there in Beijing. He sold every item you can think of with a major golf brand's name printed on it. Shoes, Clubs, Bags, Umbrella's, Towels, Grips, Balls, etc..As I grew closer to this guy and gained his trust, he would openly tell me if something was knock-off or authentic. I even visited his warehouse where he kept all these items.
Some friends of mine didnt mind the knock off stuff, so I purchased many items from my contact and sent them home to them.
The Clubs which ranged from Taylormade, to Nike, to Mizuno, all looked really good. Every major name brand was available if you just asked for it. I saw other shop's merchandise, and some of it didnt look so good. So I ordered lots of stuff for friends, and I even ordered a few sets for myself and shipped them to my house.
When I finally left China and visited my home, I ended up playing a few rounds with everyone who was using these Knock off clubs. There was no doubt, they were hitting it longer, straighter, and sinking more putts with these knock off clubs. Even myself, I brought my handicap down a few with my Taylormade clubs. Some of the materials used in these clubs were so good, oftentimes I thought I was getting the real club. In fact, my contact in China told me that my clubs were the real thing and that he gave me a good discount since I was his "friend".
This actually proved to be true when I went to re-shaft my driver in the US. I told the local golf shop about my China clubs, but they confirmed mine was authentic--a pleasant surprise for me. I couldnt tell what was real, and what wasnt, even comparing side-by-side.
Fast forward about 3 years. I now live in Africa, and decided to buy another set of Clubs made in China. What I got was a set of Taylormade R9's with the SuperTri driver. I also decided to get the Cleveland Wedges ( 60, 52 degree).
I have to say, again, that these clubs are seriously kick-ass. Im hitting it longer, and straighter than before, and Im dropping my handicap again.
However, the Cleveland wedges have shown considerable wear on the face. No longer are there any Zip Grooves. Its like hitting a smooth faced club when I chip. The SuperTri Driver is fantastic, but occasionally I have to tighten to main screw to keep the head on.
Just today I could not use the driver any more due to the head wiggling around as I swung the club. All my drives had to be with a 3Wood. Now Im not certain why my wedges have faded, as this environment is brutal for golf clubs, but Ive only used them about 8 times here. And I need to replace a screw to get my driver functional again.
And how about my buddies clubs?? Well, most of the clubs still work. The golf Bags I shipped, all the handles have broken off, and my best friends 3 woods face is concave. Seriously I saw it, its dented. ( somehow he hits straight shots with it).
Other things like the shoes, towels, and grips all are still performing quite well, as well as any of those items could.
So in conclusion, I think these clubs probably perform to about 75-90% of an authentic club. But I have no real way to compare. I know for now they are performing great, but for how long? Your guess is as good as mine.