The MSR Hubba tent is a very small one man tent. I bought the MSR Hubba Hubba tent for the extra room and it only add 1/2 pound to the total weight of the tent.
Small, very small, and roomy are all relative terms so it depends on your perspective.
The comment about adding 1/2 pound to the total weight is just wrong at least according to the published specifications. It is more like a pound and a quarter or a bit more depending on which number you use. It may be worth it to some (even many?) for the extra space but the pound and a quarter is a significant percentage of the whole tent and enough weight that it should definitely be factored in to any decision.
I am not knocking deciding in either direction, but using a weight differential that is less than half of the actual one does not make for good decision making.
Average minimum weight 4 lbs. 3 oz.
Average packaged weight 4 lbs. 11 oz.
Average minimum weight 2 lbs. 15 oz.
Average packaged weight 3 lbs. 6 oz.