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Basically, the Triplex is way lighter, but it's a little more complicated to set up, and not everyone will like how crinkled it looks. I've never had an issue staking out my Duplex and the condensation is no worse than my previous double layer tent.
For more air flow in hotter weather, every side door can be rolled up and easily looped in place. I agree that the ability to remove a rain fly on two layer tents is essential to keep from suffocating, but on a single layer tent, like the Duplex, that has terrific airflow, it's not an issue at all.
Outdoor Gearlab's (admittedly very positive overall) review of the Copper Spur UL2 here http://www.outdoorgearlab.com/Backpacking-Tent-Reviews/Big-Agnes-Copper-Spur-UL2 marks notes that its "Delicate fabrics require special treatment"--so I'm not sure where you're seeing the Copper Spur as being that much more durable than ZPacks tents.
I'm not trying to say the UL2/3 isn't a good buy, but I think you're not giving the Duplex/Triplex a fair shake. Have you had a chance to use one of these tents for a couple nights?
The tent is relatively difficult to set up and take down, requiring extensive lining, and a large even surface, with 8 lines to peg out. Good luck finding enough rocks to hold down your lines if you are camping on gravel or sand. Also, those fancy pegs wear out and break.
It suffers from being a single walled tent. Yes there are side vents (doors), however this does not compare to having a full bug-mesh ceiling, and the choice of adding a rain fly. The bath tub is great, but with such low side walls you are not going to get the protection you get in other tents.
In regards to Outdoor Gearlab's comment that the Copper Spur's "Delicate fabrics require special treatment" I would say they said this to differentiate the UL material from normal heavy weight tent materials for the average hiker. As many of the tents they review are not Ultra light tents.
The Zpack tent is great, It's an awesome piece of Lightweight tech, and Cubenfiber is really cool. I deliberated over getting one for months, and if I lived in sunny California, I would have. I just feel that by getting this tent you would always have to have your fingers crossed that the weather doesn't get too bad, and that you don't put a hole in your shiny $600 tent.