Yeap, the early 206s had quite a few problems, but nowadays they are mostly sorted out. The 307 is a nice car as well, my sister and a friend of mine have the 1.6 model and it is a very pretty and comfortable one, as well as safe. The first edition of 307 had a few s/w glitches affecting the steering wheel control system, called com2000 which consists of the wipers, lights, indicatiors stalks. Eventually these s/w problems have been rectified/solved with the facelifted model.... Any more info required???
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The 107 is cooperation product between Pegeuot, Citroen (model C1), and Toyota (model Aygo). They share floor base, engines, gearboxes etc. It's a matter which style you prefer, though after seen some pictures the C1 is the coolest of all.