Well, I am always dubious... what strikes me at the link you provided today, is the dose recommended! They are all very high.

When you need more input use our PubMed link in the upper right of the page. When you get there type in a good keyword like this:
benfotiamine neuropathy

I did this just now and found:
http://www.ncbi.nlm.nih.gov/pubmed/20188835

This study does give doses:
http://www.ncbi.nlm.nih.gov/pubmed/18473286
And does reiterate what I post that it takes TIME to show benefits. People often push the dose UP to get faster response IMO.

This is a chemical explanation:
http://www.ncbi.nlm.nih.gov/pubmed/18384109

http://www.ncbi.nlm.nih.gov/pubmed/18220605
Before gabapentin and SSRIs drugs, thiamine was the main treatment for PN. I believe it should remain high on the list for
any PNer and benfotiamine is superior IMO. However, benfotiamine at one time was super expensive and few could afford it. That has changed in the last 3 yrs or so.
Thiamine remains inexpensive, but it makes some people have a body odor that limits its use.

This PDF gives some good data:
http://www.altmedrev.com/publications/11/3/238.pdf

This is an older paper:
http://www.ncbi.nlm.nih.gov/pubmed/16359659

This is from 1999:
http://www.ncbi.nlm.nih.gov/pubmed/10219465

I used to use thiamine in bursts. A month or two at a time, in the past. When Benfotiamine became affordable, I changed to it.
I only use 150mg a day now, but I started at 300mg in the beginning. I don't feel it is a cure...but it sure does prevent progression, and take care of alot of the discomfort for me.
I do think some people have a higher genetic requirement for it.

This one from 1996: Germany where the beginning studies originate.
http://www.ncbi.nlm.nih.gov/pubmed/8886748