Just don't rely on the airbags to save you if it's a pre-2010 model
I used to be 2IC over at the C1 Owners club. 107 and Aygo members were welcome, as they had essentially the same car. Aside from minor faults on the early models which were quickly revised out the 107 and C1 were very solid cars. The Aygo, however, was a different story. In their haste to make it visibly different to its siblings Toyota gave the car it's own outer body, which also necessitated unique glass, seals, weatherstrips, welts etc. They leaked like the titanic, and Toyota never got a grip on the problem, never even really tried. They issued a few half hearted recalls to habe some cosmetically hideous secondary westherstips glued into place. This never worked, and looked appalling. Then they started suffering massive electrical faults due to the constant interior dampness. Toyota were pith poor sorting it out.
There are good cars, there are bad cars, and Toyota are as capable as doing bad as anyone else. In the end it matters not - by the time a car has been through 6 or 8 owners and it's value has dropped to £2k it's as-new integrity is meaningless. The best new car will be a shed if it's been thrashed mercilessly from cold and it's missed servicing, but a crap new car that's been well rattled and driven may still be much as it was when new.
Ssang Yong, who have a reputation for crapness, have shot to the top of the What Car reliability index, whereas Toyota are languishing below the middle ground - the exact opposite of public perception.
Buy with your eyes, not with preconceived notions of brand image.