I bought an LWD 3.5 connector several years ago and didn't care for it. The little protruding tang (tab??) which rides on the cammed portion of the slide was too pronounced and created a very noticeable resistance to racking the slide. All of my Glocks which have non-stock connectors have the Glock 3.5 unit (part #00135) purchased from GlockParts.com.
In the final seconds of your life, just before your killer is about to dispatch you to that great eternal darkness, what would you rather have in your hand? A cell phone or a gun?