Attempted to buy from them in the US - they require a "bank transfer" which I don't feel comfortable with, paypal or no go for me. I'll hold off for now.
What I will say about K-speed, is they are a very reputable business.
They have many shops around the country, I myself have visited two of them & purchased items. The guys are very helpful & knowledgable.
The down side" Thais do not usually take responsibility for thier mistakes & will always pass the buck or make excuses "loss of face thing".
You must be very clear to tell them what you want, two or three times usually works.
Payment: Most of the time for online or call purchases it's preferred to use bank transfer by means of Kasikorn bank app & Line app to communicate & confirm payments.
So for overseas payments double check correct product, price, again & again before completing.
They will avoid refunds 90% of the time & will make excuses or push to change or swop the product at most.
Just be careful guys when buying from here.