The DMM Grip is in no way self-locking, it just gives more braking power.
The Chicane was withdrawn at production as it twisted certain makes of thin ropes (twin/ice lines) when abseiling, so much that it could have been dangerous in extreme situations such as an Alpine retreat.
Plenty of products donīt make it past being displayed at the trade shows, someone complains about a patent breach, unforseen problems with production or just no interest from the retail part of the industry. |