It's an industrial descender (13mm version, the gold one is for 11mm rope) and not something you'd likely use for recreational climbing but they are everywhere in the rope access industry. I have about 15 but only 'cause we do rope access stuff. Hey Werner if I get back to the Valley any time soon I'll bring you one... :) Cheers all.
Many thanks QITNL... Yeah the ID is basically an industrial GriGri but with a panic clutch and an anti error doohickey that jams it if you try to rap with the rope reeved through the wrong way, plus the body has a becket so you can open the cover and load the rope without disconnecting it from your harness (& dropping it, killing some poor pedestrian below you...). Petzl have a smaller thing called a Rig which is like a halfway between the ID and the GriGri. There are so many industrial descenders coming out from all the manufacturers at the moment it's bewildering...
@Nature.. er.. yup.. that would be the crazier piece of gear.
Edit to add- just watched the promo video for that zig zag "mechanical prussik". That thing is wild!
As for the Petzl I'dL.. The thing is like a grigri on steroids + pulleys and cams and extra widgits and buttons . We've got a friend trying to sell a red I'D if anyone has a use for one. (which is how the subject came up).