I have the "pleasure" of working for a Peugeot main dealer these days, and its part of my job to sell these 107's.
In fairness, they are the most reliable Pug on sale today (legacy of the Toyata running gear and electrics) and as such we see very few owners back with problems.
To drive they are like the original mini in concept, a wheel at each corner, decent space and dare i say, chuckable handling (where theres about the right amount of mechanical grip vs the limited power)
The reason they are raspy is because the large rear exhaust box is mounted sideways under the boot floor, and it seems to amplify the noise inside the cabin - worse when you rev it hard.
They are ultra economical tbh, mind you, £35 fills the tank from empty.
Ironically though, the mechanically, and almost bodily identical Toyota Aygo, is cheaper than our 107!

All i would say is please dont drive the Automatic 2-tronic version.... fook me they are pedestrian, i had a test drive last weekend, 4 up (4 big uns like me) and the thing very nearly stopped on a hill... even the bloke who was driving was pissing himself. Needless to say he didnt buy it describing it as "shit" LOL