I bought a HMG windrider earlier in the spring a put around 45-50 days of trips into it this season (southern Rockies). Great pack and I might buy another if it lasts maybe another 2 years of similar usage. The cuben hybrid fabric has a crinkled 'used' look right away, but seems durable sort of (lots of small frays but no tears, especially where repeatedly folded at closure area around top and where bottom/sides meet the occasional sharp rock, but no rips). The over-abundance of HMG logo patches has been a problem as every single one has fallen off or is in the process of falling off leaving behind stitching holes in the middle of the sack panels (Easily sealed, but annoying for the price and billboard effect), also many of the stitched seams (cosemetic seams, not the structural seams that do not come taped) that were taped by HMG have extensive peeling of the WP tape on the inside of the bag.
As far as waterproofing,the bag surprised me with how many areas would need to be seam-sealed and has a hydration port that can't be totally sealed without modification, so I've always lined with a trash compactor bag on trips around moisture. Plus the above mentioned fraying of the surface fabric around the closure area at the top was un-nerving for stand-alone water'proof' use. But as BPL stated in their review, even when totally soaked the bag gains very little weight and dries incredibly fast.
Altogether a pretty great pack, but not quite the grand innovation amongst a sea of stagnation that it was originally 'hyped' as. A custom z-packs bag of the same fabric may have been the better route for me considering how easy it is to customize their features (no hydration port, pockets/straps where you want them,dimensions, maybe cheaper). Sorry no pics; hope this helps.