I test drove one a week ago. First gear is reasonably low - not as low as the petrol in low range, but seemed lower than the petrol in high range...if that makes sense. The diesel is typically revving lower, as well.
You DO need 6 gears on the diesel. Real power starts at 1800 and is all gone by 3500rpm. Mind you, it really squirts through that range, definitely feels quicker off the mark than the petrol. I was shifting a lot more than in my 03 NA Forester. THe other thing was that it was pretty quiet at cruising speed, and until I got used to the relationship between the speedo and the tacho, I couldn't always work out what gear it was in.
A bit of turbo lag, which takes a bit of getting used to, particularly trying to do a lane change into faster moving traffic on the freeway. It is downshift, push the accelerator, then move - power will come in around halfway across the lane.
Oh, and reverse needs you to pull up a lever on the gearstick. A trap for young players. It took me about 5 minutes to get out of the carpark (I got to do my test drive solo without a dealer rep).