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Really the only disadvantage of engine running under DCC is a greater need for clean track, as there are twice as many things to lose from dirty track (power and signal, versus just power). Though, the Uninterruptible Signal Processing (USP) from Lenz should make that less of a problem than it is with DC. Advantages of DCC powered locomotives: -Individual control. No blocks, many locomotives controlled independently next to each other. -Lighting. Constant intensity, as special effects (directional, ditch lights, rotary beacons, Marslights), and multiple independently controlled lights, about up to 6 (master on/off, individual on/off) -Sound. Bells, whistles, horns, exhaust, startup/shutdown, air brakes, coupling, etc. Nothing is generic, but specific to a manufacturer/type of loco) -Smoother running. Most decoders have some form of power stabilizing mechanism, keeping the loco moving at the same speed, on grades and with different loads. -Speed tables, momentum. A loco can be set up to have more control in the lower or higher speeds, instead of having a linear speed curve. Acceleration and deceleration can be programmed individually, and can be changed on the fly to simulate picking up/dropping off cars. For a glance at the really cool things fancy decoders do, have a look at Soundtraxx's Tsunami specs: http://www.soundtraxx.com/dcc/tsunami.html
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