The "new and improved" Copper Spur is, in my opinion, the way to go if you are looking for the lightest option that doesn't sacrifice on roominess, access, freestanding, ect.. When comparing directly against other similar options(Hubba Hubba NX, Nemo Dagger 2p), you are getting a tent that is about 12 oz lighter(packed weight) while providing adequate head space and enough overall room for two 6 ft tall adults to sleep comfortably.
The only real complaint I have about this tent is that it tapers too much at the feet(from 52in at the head to 42 in at the feet), which is fine if you have 2 rounded sleeping pads but a little tight with two rectangle options(20 inches is regular width). The other two tents are 50 inches wide at both ends.
Otherwise, it ventilates extremely well and prevents condensation buildup, sets up in a jiffy, and offers adequate vestibule space. I really love the little media pockets that are found all over the tent - they are great for storing your headlamp, beanie, phone, ect... The new structure design also seems to be more sturdy and durable than the previous iteration. The floor is a thinner fabric(10 D) so I'd recommend bringing a footprint along, which at 6 oz, still keeps your weight below the other options.