A final salary pension scheme is one of the best employer pensions you can get, very few Companies offer them anymore and many closed entry to them some time ago.
If you have the opportunity to join one, I would do so asap. It doesn't matter if you dont work for the Company for the rest of your life, it can be frozen or transferred depending on the scheme, either way its a good investment to have for the future, and far more rewarding than a standard pension scheme or state pension.