I had an old zafira the missus quite liked it. Visiblility was good out the front as the pillar didn't get in the way for me when looking out the forward corner. Quite Liked the seating arrangement being able to fold then slide the three seats forward and the two rear ones folding flat, positive that the seats stay with the car. Now I have an old VW Sharan [same as ford Galaxy and seat Abraham - same factory different badges] where the seats physical lift out, gives even more room, but you have to have somewhere to put the seats when removed from the car, they are not small [or particularly light either] and when your remove five they take up a fair amount of space in your house or garage. But with all the seat out you have a small van, gets a standard double mattress laid flat in the back, easily accommodates a full size fridge and a double size cooker
[both went kaput around xmas so having a van like car came in handy]
Can't remember what engine the zafira had, was quick enough as far as I can remember but my Sharan has a fair bit of power [1.9 TDI] as seems to be built for sitting at 70 on the motorway [not that I do that at all - I live in country road area] the Sharan can tow reasonably but is a bit thirsty when towing a heavy load.
Zafira 2 rearmost seats are small, as an adulkt I wouldn't be happy on a long journey. Sharan [old] has 7 full size seat / leg room.
Zafira MPG was reasonable, as good as anything else I've had. All my cars have been the older models. don't know about the newer versions. Newer Galaxy seems smaller than the old one from seeing them on the street.