Just got the RS convertible carry-on bag and am pretty happy with it. I've used it for lighter duty only so far and haven't filled it to the brim. That's coming up soon though on my trip to Asia. I would say the on thing that bugs me is how it doesn't really hold much of a shape when lightly loaded. What I do like is that I can stow my laptop and quickly access it. This became a concern as it sounded like some airports in Asia only let my laptop but not an entire laptop bag count as a personal item.
In terms of cost, I actually bought mine through Kohl's. Every month they offer a coupon for Kohl's card holders. Last month it was 30% off bringing the cost down to $62 + tax. Free shipping over $75 so I bought some cheap blue jeans that I had been meaning to buy anyways.