I am not as enamored as I once was with 4sevens.
I have several of their lights. I actually have two models of the Preon 2, one in neutral and one in high CRI (wonderful tint) that my wife uses in her nursing school classes.
The neutral one bit the dust after very light use and is currently back at 4sevens for repair. Not sure how long that is going to take and I have read that they actually send them back overseas for repair instead of just shipping out a replacement light. I probably should have sent it back when I got it as the clicky switch would sometimes not turn the light on unless pressed hard. I used it a little, never dropped or washed, and it died about a month ago with less than a year of ownership.
The high CRI model has been a gem. Trouble free. My wife has dropped it, abused it and so far, it still runs like a champ.
I also have one of the discontinued Preon Revo SS models and that thing has a weird flat spring that is problematic, even after replacing the spring with the "new and improved" version from 4sevens. I don't consider it trustworthy enough to carry and that is a shame as it was a heck of a light with a nice tint.
4sevens offers a nice, long warranty but I don't know if that will be honored or not. I bought a CR2 titanium light from them back when they had their "batteries for life" program. That was changed to five batts/cells a year for five years and it has been like pulling teeth to get the batts shipped as promised. I have had to e-mail them twice now to get my cells and fully expect to have to do the same this December. I bought the light for myself as a Christmas present and always know when my batts are due.
I own eight 4seven lights. One is in for repair, one is not trustworthy, the other six are trouble free. One model I carry with me at my PD job (Quark) and it has been dunked in water, rained on, dropped, extreme temp changes, etc. Basically used daily. I trust it totally.
And before anyone jumps in with Surefire and Streamlight love, yes, I have owned them also and have had to return some of those as well for failures.