LOW FAT - This one is the one I recommend most people build and how I generally build the circuit. Unless you are obsessed with experimenting with sounds you really wont miss the Level (master volume) control and this build of the amp provides the most plug in and play satisfaction. Every setting sounds good and the Gain switch (rather than pot) gives you 3 distinct and useful power amp settings to flavour the overdrive. If you are building a little practice/jam amp or mini head ... Definitely build this, it will provide all the tone options you could need without any unnecessary fat.