It is a great way to get the early start you need on seedlings. Plus, it makes for a great solar wood kiln to dry firewood in the summer when all our food is in the ground in the garden.
We are in our sixties and seventies and this is our first greenhouse. We wanted something that would last through our gardening years and be fairly low maintenance.
I don't have to worry about temp (although I have a heater if I need it) I don't have to worry about the wind (it is really well made and connected to my foundation well) and it allows me to have all my plants in one place without having to move in and out from inside to outside for sunlight.