I like the XM18, have owned over 20 during the last 10 years. My collection currently consists of 5 knives 3 of which are XM18's, lol
I have also owned about 20 CRK Sebenzas in various flavors and some have opened in my pocket. I have also owned about 10 ZT knives.
If you want an XM18 nothing else will do. Simple as that! You need to own and handle one to settle your desires. The best flavor of XM18 if someone wants a true flipper is the Spearpoint with CPM20CV. That run had fairly strong detents and the blade is lighter than the Spanto and Skinner, which helps flipping action. I have owned 2 of these versions and they are the best flipping Hinderers I have had, especially if you take 5 minutes and bend the lockbar a bit so the detent is stronger. I have one now that I guarantee no one on this board could shake the blade out and it fires like a rocket with the flipper. Just like a ZT0562! But it's now a dedicated flipper and the thumbstuds are really tough to use, also like a 0562.
I have also had to bend the lockbar on Sebenzas so they didn't open in my pocket too, btw.
A Spearpoint XM18 with CPM20CV is the way to go. Excellent edge holding, great flipper, excellent cutter with some beef at the tip. (More beef than any ZT model.). They are the most underrated of all the XM's made, IMO, and worth hunting one down for your first XM. If after 25 years of collecting knives I had to select one knife to own, well this would be it.
And of course this thread needs a pic!