The Trango SuperFly is a great mid-weight carabiner. Similar to competitors like the CAMP Photon Wire, it is full-sized and easy to handle, but won't weight you down like a bulkier product. It also has great snappy clipping action and is easy to clip! It comes in non-wiregate models also, but they are much heavier. I am a big fan of the wiregate version ever since I had a non-wiregate biner break on a fall on El Capitan. My suspicion is the biner failed because "gate flutter" caused the gate to open right when the biner was loaded. This is much less likely on wiregate biners because the gate has less mass.
The Trango SuperFly strikes a good balance between pretty lightweight and easy to handle. Amanda uses this carabiner to rack up whether she's trad or aid climbing.
The gate gets hung up on bolt hangers more than biners with a "hood" or other notch protecting feature. This biner is light, but no longer one of the lightest on the market.
Here, the SuperFly has been used with a skinny dogbone to create lightweight quickdraws. These biners have gone the distance in the four years since this photo was taken.
I have used these biners for everything from sport climbing to big walls, though the nose notch is not ideal for steeper routes. They are basically the only biners on my rack other than the Black Diamond Oz, Metolius FS Mini, and Wild Country Astro. The locking version of the SuperFly is called the Trango SuperFly Screwlock and is also awesome.
Amanda heads off on the Lost Arrow Spire, racked up mostly with the SuperFly, which is light, but still easy to use even with gloves on.
The Trango SuperFly is not the cheapest biner but, it is relatively affordable. If you want to save a few bucks, be sure to consider our Best Buy award winner, the Mad Rock UltraLight Bent Gate, which weighs the same as the SuperFly, but is $2 cheaper.