Fantastic choice for car enthusiast. I had driven one from one of my friends who owns an N8 variant with manual transmission. The looks, ride quality, handling, performance is top notch. It reaches 100kmh in under 10 seconds. Comfort is way above average when it comes to the hatchback standards. Suspension is 30% stiffer than standard i20 as per company claims. This is done to improve high speed stability and handling. You'll also notice the steering wheel becoming stiffer when you approach 100kmh to enable precise handling at higher speeds. It gives you full confidence at handling even at 160kmh. The N line is made to offer superior driving experience as compared to standard versions.
As for the transmission, it finally gets a proper manual gearbox with 3 pedal setup. The pre facelift DCT was notorious in causing power lags during hard pulls but this manual solves it all. The car gets a whole new character with it. Mileage is around 20km/l in highway using cruise control at 90kmh in 6th gear. In city its around 13-15, But expect 6-8Kmpl under very hard accelerations like you see in drag racing, It's a typical tradeoff for a turbocharged engine. Mileage drastically reduces when it the turbo spools at around 3K RPM. If you want it to return good mileage then drive it using light foot.
And ignore those who complain about mileage as they probably drive it pedal to the metal and expect double digits. Which is simply not possible in any Turbo Petrol cars.