Everything that Jacinthe stated is correct. The best way to buy a bachi is to do so while visiting Japan, even though that’s not something most people can do without long-term planning.
My faux-bekkou bachi served me well for quite a while, but as things are currently, the material has serious limitations, it’s not as flexible as most true bekkou bachi, and therefore makes some intermediate level techniques harder than they ought to be, and only comes in one size, which may not be optimal for your hands.
I was told when I bought it, and asked if it came a little longer, that if I bought a bekkou one, I could get just about any handle length, width, weight, and spread on the bekkou plectrum itself that I wanted, but otherwise that was it.
If you go somewhere that has a selection of bachi, new or used, you can select one that is optimal for your hands.
That said, I’ll keep my offer open to deliver one of the recycle shop bachi to anyone in Japan if they wanted to do a meet-up at some point. Right now, I think the best ones left are the wooden handle one that might need some minor repair on the handle, and has quite thick bekkou, so not very flexible, but it is very pretty. The other is smaller than average, maybe designed for a child? If someone has smaller hands it might be good. The bekkou on that one seems quite good going by the lighter=better method. Didn’t test the flex.