Is it worth a visit on a non display day?
Yes.
Flew up for the day last September. Lots to see (assuming that you enjoy looking at old aircraft!). Virtually the entire collection ( and it fills several hangars) is maintained in airworthy condition.
Of course it is also good to see them flying and I will go to one of the display days this year. The problem for me is getting back to base before my home airfield closes. Can always drive, I suppose ....
TallGuy.