The CAT stove is a great stove, and fast, in warmer weather. The can is so thin that in cold and damp weather it just doesn't keep the alcohol hot enough to burn correctly.
There are all kinds of alternatives that you can build or buy to suit your needs. Try starting at Zen Stoves...
www.zenstoves.com - Load of stove information and plans. If you're looking to buy one, all of these are made in or sold in Montana...
Personally, I would pick out a design that is suitable for your pot. Small cups, mugs and Heineken pots woudl benefit from DuraLITE*GR from Bozeman Stoveworks, or a Gram Weenie Pro on BPL. Wider pots would be suitable for the either the GR or the White Box Stove.
DIY stoves... a Good one is the V-8 stove, small and easy to make, can be used with either kind of pot.