I purchased three pair of Blundstone boots five or six years ago, the 500s, 510s, and a pair with steel in the toe box. The 500s and the pair with steel in the toe box started the sole crumble this winter. I'm shocked a reputable company like Blundstone would produce such an inferior product. The upper portion of the boot wears well and looks fantastic, but the sole of both boots is slowly crumbling piece by piece.
If this is typical of Blundstone's soles, I could not recommend anyone spend good hard cash for this inferior product. Purchase something with Vibram soles. Needless to say, I am very disappointed in my purchase and will not repeat it. Also, these boots were not mistreated in any way, worn to work (office), church, dates, etc.
I've emailed Blundstone AU about this issue and will respond back if I get a response from them.