I had recently purchased this bag prior to a three month trip. At the end of the trip the wheels were damaged and bent in. This happened with only 45lbs or gear. It is a nice bag, but only for airport travel. This bag lacks the strength and durability to be a large duffel.
Since writing this post I opted to go with the REI 34 inch rolling duffel. Im not a huge fan of REI, but their bag seems much more durable and better constructed than the Patagonia bag. The Tatonka Flight Roller looks like a quality bag as well and is quite large at 135 L.
The bag is great, but having a wheeled duffle I expect it to be really tough. The new material that patagonia is using on their black hole line of duffles is not as durable. This is fine for the rest of the duffles, but the wheeled one needs to be a little more durable to take all the abuse of being dragged around corners and getting pulled up and around stair wells. In my opinion the north face wheeled duffle is far more durable with its thicker fabric. Yes, the NF bag is a little heavier, but for the purpose that trade off is worth it. I love all the black hole bags, but for the wheeled option I would go with the NF.