I've been using a White Box "Solo" alcohol stove with the Vargo 0.9l titanium pot/lid for about two years and it has become my favorite cooking system.
Pros: small, light (1.1oz on my scale), simple, reliable, highly efficient
Cons: unstable (needs a firm level surface), cannot simmer (either on or off), a bit awkward to fill and ignite
The WB stove is incredibly efficient. I carry only 1.5oz of fuel per day in the summer and 2.0oz/day in the fall and spring but often use less. Experimenting with denatured alcohol, pure ethanol (Everclear $$$) and Heet gasoline anti-freeze I concur with the WB manufacturer; "Heet' or similar brands of gasoline antifreeze produce noticeably greater heat output per unit volume.
The WB stove must not be tipped or tilted while lighting/burning as liquid fuel will leak out of the burner ports and create a potentially dangerous fire outside the stove. The depth of the "well" in the center of the stove makes it difficult to ignite a small amount of fuel. Simply use a dry twig or stem of grass to carry the flame into the well and avoid burning your fingers or gloves.
For optimal effiency it is important to find a pot with a diameter slightly larger than the diameter the flame. The 0.9l Vargo (5.25" diameter) works well with the WB Solo model. The stove has the same diameter as an aluminum beer bottle and is inherently unstable when supporting a water filled pot. A firm level surface and functional pot holder is important to success.
The stove comes with a sturdy aluminum wind screen and base plate. You can easily make a lighter, albeit less durable, wind screen and base plate with heavy duty aluminum foil and a hole punch.
For heating larger volumes of water for a group, I can visualize arranging three WB stoves under a large pot (10"-12") to provide stability and more energy. I'm not sure the WB Stove folks would recommend this method. If anyone has tried the multi-stove approach, I would like to hear your feedback.