I had a 205 before and wanted more room as we have 2 pups. An estate was the obvious choice. The 306 feels smaller than the 405 and much more modern styling.
The standard car is underpowered. It only has 90bhp and that is just not good enough for a diesel estate.
My wife has a 405GLX turbo diesel and that is much better.
To sort the performance problem I had a chip fitted at about £300. It has given the car much more pep when driving and I've actually had the power to overtake things on A roads - where previously I've had to sit behind lorries!
The car is nice to drive. It is very comfortable (especially after a 500 mile trip) and everything is well screwed together. I also like the styling of the car.
It is cheap to fix and service. I had thought about a BMW Touring or Audi Avant, but was put off both of these cars due to high servicing costs.
The only downside I would say is the performance. Even with the chip, it is still a bit gutless. In the 405, we can fly up Holden Hill near Exeter and still be doing 70 at the top, whereas in the 306 I'm doing in 4th gear doing 60!
As for dealers, I've only had one experience of Peugeot main dealers as I tend to use a local independant garage.
Finally, as for Peugeots - I'm very happy to stick with this brand having had about 6 so far. They are easily my favourite manufacturer and we all have Peugeots in the family!