Here's another option altogether. A tuck-able pure kydex IWB holster that I LOVE for my Glock 23. This is my EDC holster and I wouldn't trade it for the world. Link Removed
It's comfortable, super secure, adjustable, and a one-handed reholster is easy 100% of the time. I've even wore a dress shirt tucked into it and no one even noticed due to the fact that the clips do not extend all the way in front of the belt.
It's Israeli-made, and shipped to my house within 10 days of the order date, rather than the much longer time posted on their Amazon site.
I'd buy this holster again in a heartbeat.
Not trying to derail you. I've heard great things about both the King Tuk and the Supertuck. This is just a different option to consider.