it seems your are right if you leave the netting at home and just go with the fly and ground cover.
http://cascadedesigns.com/msr/tents/fast-and-light-tents/carbon-reflex-2/product = 2 lbs 12 oz the whole tent or only 2 lbs with just the fly and ground cover. this tent does appear to be slightly bigger than the Firstlight.
Firstlight = 2 lbs 11 oz
these wieghts are from the manufacturer specs, not sure how accurate they are.
I have a firstlight, and have to make sure my tent mate is not over 6 foot or they don't really fit comfortably. i've seam sealed it and been in the rain and snow with it and it was just enough to be comfortable. i haven't been in a deluge with it though.