I got one of them once, and answered honestly.
Haven't got another one....
To be fair the warranty terms and conditions are there for those who seek them out (Battery 12 months, rattles etc about 2 seconds). However (and this is the reason I think Kia have gone for 7 years) Car purchases are now covered by the new legislation which looks at 'how long something would be expected to last having regard to the purchase price. So their 3 years on the radio is a bit suspect, given most can argue they would expect the car radio to last nearly the life of the car. Same with a battery, most come new with a 24 month warranty.....
Unfortunately like most things in life, there are those who seek to pull the wool over your eyes.
As for the replacement car, I suspect old mate has made a blue depending on the model quoted. You can certainly get good prices on a new I30, and you can certainly get good prices for a 3 year old i30 diesel with 60k on it. Unfortunately dealers don't keep too many used cars, so they wholesale them, and give you that price.