I carried a Novatac 85T for at least a year and never thought about another flashlight until the EX10 came along. I've always wanted a Piston Drive flashlight and could never afford one of McGizmo's custom creations. The Nitecore EX10 and D10 are just about perfect EDC lights if you don't have a need for a user pre-set level (which most of us don't).
The light is small, has easily accessed high and low modes, a variable middle level, a really nice feel, is made of a higher grade of aluminum, has probably the most reliable switch mechanism out there and is fairly inexpensive. Pairing the EX10 with Russtang's crenelated Ti bezel gives it a little extra length so it now fits perfectly in my hand. With AW's R123a's and a Nano charger, I am set for at least until Nitecore does a Gen2 Piston Drive light!