Yes it holds your puzzle
Yes it's better than pieces everywhere
Yes you will need a whole dining table for it when open.
No you cannot carry or store it vertically.
It does the job but is very large and heavier than you'd expect. Finding somewhere flat to store it is a challenge.
Fantastic to store away board game items between campaigns
Practical for storing all flat parts of RPG board games and it firmly stands upright in the space between the fridge and the wall, away from kids and cats making it very quick to set up the game for the next campaign.