Using them on mic booms ATM, to hold my Lewitt LCT 140 Air microphones. 
 
Pro: Perfect fit. 
Integrated 3/8" holder, you just have to remove the ¼ inch to 3/8th that is already on the mount. 
 
I'm a very happy. This unit is arguably better built, has a tighter grip, better rubber bands and holds smaller mics than what most SCM shock mounts on offer all over the web. 
 
I do recommend for pencil condensers, I can't, however, comment for on-camera shotgun mic usage, as this is not my use case scenario.