I've had a few pair of the Grizzly Mocs over the years. In the past I purchased with the Chromepak sole, but the latest pair were the Vibram option. Honestly I think the Chromepak may have worn just a little longer before needing to be refurbished, but if they get just a little damp the Chromepak sole can get quite slippery. I wear them frequently (mostly inside, but occasionally outside) and the Virbram lasted me about 2 years. As soon as small hole started, I sent them in for refurbishment and they came back within a couple of weeks looking and feeling great. The soles are brand new and I think I'll get another couple years at least. Quoddy's Mocs are expensive, but well worth the price in my opinion. Personally, I highly recommend the Vibram sole and refurbishment as soon as a wear spot forms forms a small hole in any area.