I love my VB-16, which is essentially the same at the CPF Special that Wits End sells. It's been our baby checking light of choice. On high, it blows away everything else in my arsenal and compared very well with the U2 I got to play with in the CPF passaround.
Right now, I'm obsessed with finding an EDC with multi levels. I'm using my Fenix L1P with Nekomane CR2 body the most as my everyday EDC, and had been hoping that the new L1T head would make it into a multi stage light. But, it's not promising at present. I'm hoping Nekomane and 4sevens will collaberate on a new CR2 body if the original one (actually version two) doesn't work with the new Fenix L1T and L2T heads.
The Proton looks promising despite the nervous thread that has everyone micro-analyzing its shortcomings, even though none of those doubters have touched the light yet. What I love about the design is clicky and the way to switch levels on the side, much like the VB-16.
However, now that I'm spoiled by the size of the Fenix Nekomane CR2 and doubt I'd love the Proton as an EDC pocket light unless we can get a mini Proton version, too. Now, that would be cool!
I have another CR2 light, the JIL 1.3 UP, but think the Flupic version is a bit complicated for my tastes, which lend toward a very simple to switch light with a clicky. Still, the JIL is a great single stage light, IMO, although I know the FluPic version has many loyal fans.