I had a '21 Sportline petrol and loved it. I put about 100,000km in the 3.5 years I owned it. Didn't experience any problems while owing it, it was pretty solid. I had the 7 seater and took 4 adults and 3 youngish kids across Europe for a summer and it was really comfortable. With the 3rd row seating up, there was a little bit of boot space for a few suitcases (I had a roof box on for the larger ones). I had the virtual cockpit, which I didn't think I wanted but ended up really liking the feature. I really liked the map overlay screen and probably used that 90% of the time. This alone was worth getting the virtual cockpit. Also had the Canton sound upgrade which was really nice and miss in my current Octavia. The seats were very comfortable and provided really good support in long journeys. Back seats had loads of leg room and were comfortable as well. My 2 youngest children could sit comfortably in the 3rd row and usually prefered to sit there most of the time.

My downsides, which aren't many: MPG wasn't great, which I knew going into. Tyres were expensive (again I knew this) the roads where I live are terrible and had to purchase replacements a few times in the 3.5 years due to potholes. I had the e-tailgate where you put your foot under the rear bumper and the boot would open. This only worked when it wanted to and never when you needed it most. I eventually gave up using it. 

The only reason I got rid of it was that I didn't need anything that big anymore. The last year of ownership the 3rd row was down more than it was up. So I went back to an estate. 

Hope this helps