I only discovered RS about a year and a half ago, so I can't comment on the 19" bag. But I purchased the current rolling bag a while back and it's turned out to be one of my best pieces of luggage. It's mainly used as a carryon but has handled being checked quite well. The expansion feature is nice, and the bag is all around durable and functional.
I bought this bag because I wanted something that would pass muster on both domestic and transatlantic flights, and the rolling carryon really fits the bill, though it's too large for US commuter planes or (I assume) most intra-European carriers like Ryanair. Most of my travel is on major American carriers, and I've never had to check the bag except on the rare occasions when I needed to expand it and pack it really full. Plenty of pockets but not too many. I really like the full length pocket on the front which will acommodate a light jacket or sweater.
The bag is in the medium price range, but is currently on sale for 20% off. I recommend it. (No, I don't work for RS, just a satisfied luggage customer;)