Looks like a "Hubba Hubba" though fewer poles (not freestanding) and the poles are carbon fiber instead of aluminum. Also one less door. Same size floor space and vestibules. Hence a little lighter. Other differences??? I like my Hubba Hubba, son carries poles and I carry tent and fly. He usually sleeps in his hammock, but doesn't mind carrying poles just in case he wants to share my tent. I don't think it's worth the upgrade,

True...there are not many dimension differences between the Hubba Hubba and the Carbon Reflex 2. In fact, the Hubba Hubba is arguably more livable based on the fact that it has two doors and two equally sized vestibules, and it's freestanding (more convenient not necessarily more weatherproof). However, the huge benefit that the Carbon Reflex offers is in it's incredibly low weight. Whenever you can save pounds in carrying weight, not simply ounces by cutting your toothbrush in half or trimming the labels off your clothes, and not sacrifice livability, it is worth the upgrade. The Carbon Reflex's weight is almost 1 1/2 lbs lighter than the Hubba Hubba while giving the user or users the same protection and livability. This does come at a cost, but the end result is a lighter weight and smaller pack. In the end this ultimately means a more enjoyable trip. I often recommend that the best weight is saved through the 'essentials' in general backpacking (sleeping bag, tent, sleeping pad, and backpack). The best part is that in our day and age we have so many choices based on cost, weight, comfort level, etc. There are three realities in purchasing new gear; high durability, low weight, and low cost. Unfortunately you can only have two...