My current preferred is the Nitecore MT06 - I really like the solid feel of it's switch and the impressive throw of this little light, even though I ordered it by accident when intending to order it's 3 mode high CRI brother the MT06MD, which was mentioned above.
It doesn't have a low low, though, so I'll still be ordering the MT06MD, but will be keeping the MT06.
The MT06 replaced the IYP365, which I never acclimated to it's M-L-H UI in my shirt pocket. I just don't like to carry or operate the IYP365. I hate it's UI. The switch on the MT06 is much more solid and certain on the partial presses than the IYP365 - it's real easy to accidentally do a full click with the IYP365 when intending to do a partial press, but that's not likely to happen with the MT06.
I'm hoping that the switch on the MT06MD is very similar to the switch on the MT06.