I love this thing! Here's my 20D silpoly lineup in order of purchasing, including real weights (lines, hardware, sack)
Mamajamba: 14.60oz
Superfly: 21.30oz
Thunderfly: 16.05oz
The Superfly was primarily my winter tarp. Looking back, I only remember using it a few times outside of winter. One time I had a good thunderstorm which was great; it was fun sitting in a chair underneath and felt like I justified bringing it.
The Mamajamba was my goto tarp, coming on almost every trip. I never got wet, but when the rain was anything but straight I felt like my dry area was limited. Not a problem by pulling things in closer; less gear sprawl. Still great in porch mode.
Before receiving the Thunderfly, I was wondering if it would be too close to the Mamajamba. Would the small doors make a difference? Absolutely! I also don't like mess...keep things simple. Luckily, this only requires two more short pieces of cord to pull out the doors when clipped together with a biner. When the light rain started, I immediately knew I made the right decision. The width is about the same as the Mamajamba I'm used to, so porch mode is very comfortable. And the beaks formed by pulling out the doors blocked 100% of the misty, swirling rain that would have otherwise blown in. This also has a few more inches of strap out of the rain, so I didn't even bother with drip lines.
I'm pretty sure this will replace at least 50% of my Mamajamba usage going forward. Pack size is literally identical. Another home run from Warbonnet!
Here it is in porch mode, hung fairly high since it was warmish/calm most of the time
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