Here's what other sites are saying:
Gearing up for The Nose' Giving it a go at the Shield' Make sure you rack up with the Petzl Owall Carabiner. Its oval shape prevents dreaded 'biner shift when you're aiding on sketchy RP placements, and the snag-free Keylock gate allows you to un-clip your previous hook placement without bumping it off the ledge. The Owall Carabiner is also an excellent choice for racking your nuts, pitons, or hooks.
The oval-shaped Petzl OWALL is a general purpose carabiner for trad and aid climbing. Ideal for racking wired nuts and other protection: gear doesn't snag on the Keylock.
For aid climbing, the non-locking Owall symmetric straight-gate carabiner clips in very easily to the anchor point.. . . . Symmetrical oval shape facilitates use with a pulley. Ideal for pitons or etriers (easy to flip over). Reduces bunching of equipment clipped to carabiner. Non-locking (oval clips in very easily to the anchor point). Keylock system (snag-free body/gate interface).
Petzl's Owall Oval carabiner is an ideal combination of any-climbing use and true value - straight gate design and exceptionally strong, this biner has the classic straight gate design that will fill out your rack without sacrificing your life savings.
- Mountain Gear