I own a few TB bags and feel very strongly that although they are well made bags and attractive, I can easily find something cheaper and with similar quality elsewhere. But one thing I must mention that (and not sure if anyone agrees with me), is out of all the TB bags I own, I think the shop bags are superior to any other bag in the line. I feel that the shop bags are an item that cannot be found elsewhere and has no duplicate anywhere. I think if TB wants to grow they should exploit (offer variations of) the shop bag in multiple combinations (open, with zipper, pockets) and focus on Dyneema over cordura. The Cordura TB bags are my favorite and make up the most of my collection but again, I can spend far less somewhere else.
The dyneema products are just amazing. Not saying I would carry a dyneema backpack but I would purchase for other things. I do have the travel tray (which I adore) but to me the shop bags are the most used, the strongest, most attractive, most comfortable, most versatile and most unique product I have purchased. I already own the small and large but I'd put my money on variations of other ones if they ever get released.