Condensation was definitely a concern with the triplex, but we decided it was worth the weight savings on a trip this long where food weight begins to be a problem. We were fortunate enough to have fairly dry conditions for most of our trip on the WCT with no significant rain and not that much fog. Since then we have hiked Cape Scott and the North Coast Trail with our triplex and I took our Zpacks Plexamid on the Juan de Fuca trail. We experienced wetter and foggier weather on those trips and definitely had some condensation inside the tent. However, were careful on all of those trips to spend a lot of time getting the pitch nice and taut so the floor vents were nice and exposed. I also find bringing a small quick dry towel to sponge down the inside of the tent helps a lot. Using a single wall tent is a lot more work and can be a little less pleasant due to the condensation, but for me the weight savings are usually worth it.

Happy trails!