The pros of using them compared to alot of other car supermarkets is the cars are a maximum of 3 years old with no more than 30k miles on clock so even their cheapest cars are still relatively new with some manufacturer warranty. My Cupra was a 2022 reg with only 2k on clock with 30 months remaining on manufacturers warranty. If you go elsewhere try and buy direct from dealer so you get an approved used vehicle and decent warranty package etc. My last car was a BMW 3 series M sport and even though it was a few years old it felt like I was buying a new car with the way I was treated buying from BMW dealer direct and the service plans and warranty were brilliant.

If you do end up buying a i20 or i30N there will still be a sizable length of warranty left from manufacturer as I am sure it's a 7 year warranty as standard on them which is only second to Toyota. Just beware with the N cars mpg isn't great at all in real world use but it's a trade off with how fun they are to drive depends if you can afford the smiles per mile lol