I know Think Tank bags are highly recommended because they are durable and their warranty/customer service is really great. I was looking into a roller bag for my camera and came across this bag. Does anyone here have one? How do the wheels hold up? I shoot HS sports and walking to these fields from the parking lot with all my gear is annoying so I was thinking of a roller bag. How well does it roll on grass/non-paved pathways? Thanks!