Craig mentioned the Scarp in his OP.
Nice Pix from you and others. Thank you.
Was trying to decide whether to use some Epic Malibu, the same fabric that was used on the BD's, for a new tent project (freestanding).
So, spent megatime on the web reading reviews.
As here, there was both good and bad, including some awful failures. It was odd that people reported totally different water resistance in similar wet conditions.
But noticed that none of those reporting having actually observed and experienced failures affirmed that they had carefully seam-sealed. Not sure that many even realized the early BD Epics were not seam-sealed, since most products from the larger companies have been seam taped for some time.
Also, considering the jacket reports, noted that the fabrics used for jackets were not the same as the Malibu used by BD. Also had an Epic pull-over myself that wetted right out in heavy rain.
Noted also that BD's Malibu changed. The later version appears to be calendered on the inside, while the earlier is fuzzy on both sides. (Observed that BD put the calendered side on the inner).
Liked the qualities of the Malibu in other respects: Flexible and non-noisy, but doesn't sag due to the polyester. Under 2 oz/sy. Definitely does MVT in many conditions. So decided to risk using it for the half of the tent above the sleeping areas, but make a .5 oz Cuben half-fly to cover it just in case.
Am inclined to think that BD would not have shifted to the NanoShield were it not more water resistant, especially after the negative reports on the Epic. Have not been able to find any reliably negative reports about the water resistance of the newer NanoShield version. Would definitely get one were I not biased aganst the inside pole setup. Many report that it is not a problem though, and easy to get used to.
If you are serious about going up to 5 lbs, you might take a look at the Luxe Tiger Moth, which is 5 lbs, and is definitely a 2 person tent. The design, like the Firefly's, is uniquely suited to using stiffer carbon poles that would drop about 3/4 lb. But the BD's are obviously more space for weight, if you don't mind the internal setup; plus with some practice, they will go up in the rain without water entering the bathtub floor.