ok didn't have the sport but had a e3 and hated it!
main seat-
very thick luxurious padded liner make seat much more comfy and dd1 doesnt look so far down in it iykwim?
the strap bit thats connected to the back can be twisted and moved up and down to adjust the height to where shoulders are so no huge gap above lo
harned improved ten fold its just a easy 5 point harness rather than the old weird version thing!
bumper bar moves in two different positions
handle bar-
still adjust like the sp and e3 but the brake is on the handle. one click of a red button and the brake is on (a very good one too!) push down a blk button bit and brake off!
hood is bigger and better than before
second seat just as the main one except smaller!
no adaptors for second seat you just unclick the bumper bar and click on seat for the newborn toddler mode (which i used today with my 8 month old so she got a good nap! its so easy to quickly swap over)
the toddler seat folds with the buggy. you unclip some bits on chassis and push the main seat unit up and second seat forward and fold! you can also do that and tuck the second seat out the way under the bit that reclines the main (sorry to confuse!)
to fold the buggy has been improved you have two handle one each side lift up and press down on the saftey catch and then fold very very easy!
erm raincover for double much better doesnt flap about like old ones
i will keep thinking........
although the vibe is more expensive in my opinion its worth every penny! they have improved or changed everything i hated about the old models!
it looks bloody fantastic! soooo stylish! i get lots of looks with it! i am a complete pramaholic and i would go as far as saying that i am reformed
hope that helps? i have prob missed loads and will add on!