I would agree with all that. I have seen accounts of problems with the
307, but this is because I have mainly only looked for 307 reports.
My own 307 SW has been fairly good. The only issues have been common
to other HDI models, so cannot be blamed on the 307, with the
exception of one front wheel bearing (at 100k).
The most unreliable car in our household has been a VW.

However, conversely I have from personal experience found that "common
faults" really do mean common.

Over 6 years, our (when obtained) 3 year old 306 suffered from:

Repeated worn suspension bushes (replaced twice in 6 years with little
speed hump use)
Dodgy airbag/pre-tensioner wiring causing airbag light to keep coming on
(easy to fix temporarily)
Dodgy central locking wiring due to break in door hinge (thankfully only
a problem when locking from drivers door, unlike other people which
stopped you locking at all)
Window regulator cable snapping (mild steel rusted through!)
Idle control valve failure.
Finally, coilpack spiking ECU causing odd problems.

I believe all of these are common problems for the 306.

We replaced it with a Ford Focus, only to find that within a week or
two, it had suffered from another 'common problem' for that model -
leaky washer jets leaking into the spark plug wells causing corrosion of
the plugs and leads leading to a misfire.  Fixed under warranty, but
required a head removal as one plug snapped.  Glad it happened then and
not 6 months later when warranty had expired.

So, from my experience - listen to these 'common problems'.  I've yet to
have a car which has not experienced a number of them.

Of course, you need to determine which really are common, and which
aren't.  Lets just say I didn't quite get that right with the 306
(although I loved the car, and all in all, it wasn't too bad once you
accepted its faults).

D