Here's what other sites are saying:
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.
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.
For aid climbing, the non-locking Owall symmetric straight-gate carabiner clips in very easily to the anchor point.
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