While I don’t personally use neck knives all that often, Thomas used to EDC both his modified CRKT Minimalist and his modified Boker Microcom in the past quite religiously – sometimes not even taking them off when he slept (not a good idea by the way; they’ve slipped out on more than one occasion because of the way they were modded). Both these knives he personally modified (and quite heavily at that) for the intended purpose of making them more discreet. You can hardly see a print under his shirt when he EDCs either of the two.
The other two neck knives, the ESEE Candiru & Izula, are of course more outdoor/survival & bushcraft-oriented than they are EDCs. They’re more comfortable than they look and are quite convenient as backup blades.
Everything’s got it’s use. And while we have a number of other neck knives, these are the ones Thomas most frequently carries.
If you’re into neck knives, you might want to check out his article on the best neck knives to EDC.