Just received my econ 40* set today. Less than two week turnaround, awesome! Quality is exactly what you'd expect from HG. Construction/fit and finish is identical to my regular Incubator, fabric is nice although not as papery thin as Argon, weight increase will only be noticeable if you're the most diehard of ultralighter. Used the Burrow on my bed last night, had to open it up or I got too warm. Haven't had them outside yet, but it would appear from everything that unless that extra few ounces actually matters to you, and it should be reiterated that these are still a solidly lightweight option, this is absolutely the best value currently going in quilts and highly recommended.