Whilst the ANGE S is not quite the lightest quickdraw on the market, it is very close and the Petzl ANGE S does have some great features. Firstly over recent times clean nosed carabiners are seeing more use and are increasing in popularity. In terms of wiregates with clean noses there are only a few options. So far these have been normal sized wiregates such as the Wild Country Helium and DMM Shield. The Petzl ANGE S brings the lightness benefits of a small wiregate with the practical usability of a solid gate.
In addition to it being Keylock, the nose itself is pretty narrow so is so great for clipping pegs. Other plus points are the wide contact zone where the rope runs to prevent tight curves in the rope, and as an added benefit will prolong the life of the biner. The sling is narrow dyneema, helping keep the weight down. The clipping biner is held in place by the Petzl String, making for steadier clips.
Overall we say that the MonoFil wire may look a bit odd, but there is no reason to treat it any different than any other quickdraw. The ANGE is going to be best off as a trad draw, as an unfortunate draw back to the design is that they are not Beta Clip Stick compatible, which is a pretty big consideration if you do a lot of sport climbing.
Petzl's MonoFil Keylock ensures smoother opening and closing of the carabiner and a much longer lifetime compared to traditional wire gate carabiners.
The wire gate is protected from lateral rubbing (against rock, etc).
The unique H-profile allows an optimal size and strength-to-weight ratio.
The indent on the bottom of the ANGE S and ANGE L carabiners helps keep the STRING in place so that the sling is properly positioned on the carabiner.
The surfaces that come in contact with the rope and with the anchor are wider, favouring passage of the rope and reducing carabiner wear.
The nose of the carabiner has a hole that allows ice, snow or dirt to be cleared out.
The deflector works with the shape of the carabiner to allow proper positioning of the carabiner on its major axis.