This is the best stroller I had (despite a few weaknesses). My daughter started to ride in it when she was not yet sitting by herself - even in a fully reclined position, she had a good view from her seat. In the Britax Go Big she would not be able to see anything. At the moment, she is 8 months old, and she sits there comfortably, not sliding down.
This stroller is light, compact, equipped with a suspension system and large canopy - but it is not sturdy enough, and I cannot imagine the winter with it. However, this can be fixed by buying a Bugaboo canopy 😉
The liner is made so that it is double secured above the shoulders, so there is no chance for it to slide down. However, it is time-consuming to mount it as the whole strap system has to be ptakenut out (it would be the same with the footmuff - it will hold when strapped in).
For me, it is a great stroller for the good price 🙂