Used one on a Glock 23 and an LCP.
Was very uncomfortable with the Glock using it...Trigger is larger and even with the safety lever, clothing might work into it.
Felt better with the LCP. A bit smaller opening for the trigger and the heavier pull was less likely to be manipulated. Stopped using it because it was a pain to draw...compared to my EDC of the 23 in a Crossbreed IWB.
In a jacket pocket, the LCP (I carry both the LCP and the 23) is likely to be the first responder in a surprise attack...my had will be on it.