I have the R-103 and I like it very much. It carries a lot, well built, and most importantly it is comfortable to wear. The one thing I didn't like was packing a laptop with it. I have a 12.1'' HP laptop and though it fits, it seems a bit snug. But even if you don't always carry the laptop, you could use the slot for other things like magazines, books, etc.
The bag is best for hikes, etc., when I want to bring most or all of my gear. Many people on the forums have several bags for different situations, and I am one of those people
