I have various generations of the Klarus XD2C in 580 lumens, 725 lumens, and 1,100 lumens, as well as the 1,600 lumen XT2CER. The XT2C's are all very nice lights. For reasons I do not fully understand, I can leave an 18650 cell in any of the XT2C lights, and after a few years, it will show very little difference in voltage despite the electronic switch. However, My XT2CR does have parasitic drain, so checking the cell voltage every couple of months is important.
My XT1C will significantly decrease the voltage of a 16340 cell in a few weeks. It is also very easy to accidentally turn on in a pocket.
Some of my Klarus lights have been dropped repeatedly on various hard surfaces without damage.
Many of my 18650 and 16340 cells are from Klarus, and they all work well.
At the price, it is relatively painless to upgrade when improvements come out.
They are definitely among the better Chinese lights, and I carried that brand for years.
Unfortunately I did not have good luck with the P20 high color rendition penlights. I ordered two. One works fine. The other was replaced multiple times by the vendor, and all of the replacements failed to work. That experience, and the introduction of the Bodyguard lights caused me to switch to Malkoff.