I bought 2 different bundles of 25 planks from Frank's. The first was absolutely gorgeous stuff but every bow I made from it suffered a bamboo failure. I spent 6 months replacing bows that failed, used local bamboo on the replacements, no failures.
Tried another bundle from Frank's, this bundle arrived waterlogged with every plank moldy. threw it all away. No more bamboo from Frank's for me.
On the bows that failed I did scrape all the rind off which may have contributed to the failures. I have done the same on local bamboo with only a couple failures in 30 or so bows.