I have done 2500 miles in mine so far. I had an Octavia with the 1.9TDI engine before it., and a Leon with the 1.9TDI before that.
On paper both engines are the same, but the 1.6 being common rail is much smoother and more refined. As with the 1.9 it could do with a little more umph, but that's not to say it is underpowered (if you know what I mean)
It's too early to make mpg comparisons yet, but I would expect a better result than that of the 1.9 (which ended at an average of 48mpg after 60,000 miles)