I accidentally poped on to this thread, sorry that I am not speaking french, maybe someone can translate.
Fake/not fake problem since a few years has been really growing. As I have a lot of experence in that topic, I thought my help can be appreciated.
There are different approaches but I've always tried to find golden mean. On one side comes quality and high price, on the other low price and
avability, whis is the most valuable in pen spinning (white anyball, huh!). There are different manufacturers in china, so it is really tough to say that all their products are bad. For instance there are 3 or 4 versions of anyball and sailor. I personally try to pick the best out of these fakes. If you really want, I can advice what is good and what is bad.
Second thing is that each new generation of their product is better and better, some are really close to original.
As comes to Dr Grips sold on Pens Factory, that's right this is not a product made by Pilot originally however it is one of the best copies out there, and people are really happy with it. Tidus there were several versions of this Dr Grip on Pens Factory, harder and a little softer, so they vary. There is chance soon I will be selling original product.