For those who tuck these AIWB, trim ~1/16" off the plastic nozzle tip of the canister. As-manufactured, the tip is long enough to activate enough to leak at times. This leads to one having OC drool down their dick. I can say with certainty that effectively spraying your package is no fun, particularly while driving. On the same topic, the larger Street Defender can awkwardly print in the crotch thanks to its length and girth so try one on before heading out. The Street Defender also has a rougher surface which chews through pants faster than the slicker Key or Palm Defender.
That said, the Key Defender will still eventually eat pants. I wear a new pair until the fabric starts to show the "hotspot" and then have my better half sew a patch of whatever scrap fabric is handy over that on the inside as an abrasion guard. Usually cut from jeans a kid outgrew or tore up beyond repair.
And seconding the quick release. Just remember to loctite the little index pin. It is threaded in and can come loose. In addition to making for a more secure yet quickly detachable key mount, it makes the unit ride more securely IWB.