I'm not sure exactly which models are affected. It's no big deal, anyway. It only occurs when there is a little torque on the shutter release. If you use the usual index finger straightening method (right index finger second joint placed over shutter release) you probably won't have the problem. If you use another method I'm not sure that there is any real advantage in using the losable thing, except to waste frames and drain the battery. I'm happy with either full-size or mini versions.
Best,
Helen