Penetration for this type of transmition is in the US is very small. Hell, Ford has been using a DCT transmission in the Mondeo and other cars in the EU for years. But they still went with a standard 6-speed Automatic transmission in the US version with the completely new Fusion. I think putting it into the Focus was a decent way to break it into the market for them and in a couple year you will see it grow."Many? " Which cars are it in? It's also not just the number of gears but how smoothly and quickly it shifts, and how it behaves in manual mode. And how much our how little slush is in there. I must confess to never having tried that tranny so I don't know these things, I'm asking. But I don't recall seeing it on many under-$30k cars. Except possibly the full-size Chrysler/Dodge platform, but even many of those are over the $30k mark.
For people wondering why the Focus. Remember that the Focus/Dart/Cruze are going to be the biggest items for the manufacturers to push gas mileage up ofr CAFE standards. Ford doesn't have much CVT experience. So for them its either go the Chrysler route like they did with the Dart and do manual only or use a DCT like they do in the EU. Manual only would kill the sales of one of their top sellers. So DCT wins.
In the EU manuals have always been a stronger seller. So any automatic approach would have to minimize the efficiency loss. DCT does that.