Had it now for a few weeks and used for long commutes to work. It is very light and spacious (iPad, lunch, spares, 2-3 A5 notebooks..) and fits the rack well. I keep it fixed to the rack at all times - not sure how long the velcro straps would last if it was taken off every day. The two small panniers come useful as additional storage on longer rides. Overall very pleased I switched from large panniers, I used previously - top-rack makes a lot of sense.