I am on my second pair of these.  The first pair was purchased about 6 months ago (also the v2 version).  I noticed that the soles, in particular the right sole was separating from the shoe at the back.  I believe this was caused by driving, the right heel rests on the floor of the vehicle to push the accelerator.  I think that they should last longer than that, even if you wear them for driving.

Anyway, that pair was worn out, so I ordered a new pair from Amazon.  After wearing the new ones less than a month, the same thing happened!  I couldn't believe it!  The back part of the sole has separated from the bottom of the shoe.  This creates a "flap", which besides being really annoying, is unsafe for walking and driving.  By the time I got around to investigating, I'd exceeded the Amazon return window, so I called New Balance.  The person I spoke with was very helpful.  Bottom line, I shipped the shoes back to them a few days ago (I paid for shipping), and they will send me a new pair (they pay return shipping).  The customer service person said that a month was really too short, the shoes should last longer.  He said they usually tell people to think about replacements after 8 months of use.  That seemed really short.  I had expected these shoes (any shoes) to last at least a year.