Stock light:
1. UI is decent.
2. Regulation is great.
3. Durability is great. Dropped it a lot. Never had a problem.
4. Brightness is good at around 1095 lumens at 30 sec for me.
5. Beam is trash because of the XP-L2.
However, it is super easy to mod.
Just open up the head, plop in an SST-20 4000k and you are good to go.