A greenhouse is an investment that should last you for many years.
Solexx Greenhouse material comes with a 10 year warranty for UV protection and stability of the material. It is reasonable to expect a Solexx covering material to last for 20 years, depending on exposure.
In a greenhouse you are creating your own environment. You may also find you need ventilation, heating and cooling and that will depend on the size of the greenhouse you desire and the climate you live in.
With a greenhouse you should be able to enjoy many years of pleasure that is often good eating. It's fun to enjoy a few home grown tomatoes in February and it's surely possible.
Make sure you get to see what you are purchasing as it is an investment. That's money and time with rewards for the efforts.