Worth repairing a Velodyne ULD-12 from the 90's?

I have the ULD-15, a MK I and a MK II. 

On the MK II, the foam fell apart. 

I bought a kit from these guys:

https://www.springfieldspeakerrepair.com/collections/diy-foam-surround-repair-kits

It was far easier to do the repair than I imagined it would be, as the cone tends to just center itself.

It works like new. 

I recently had my DD18 repaired, had to have the amp rebuilt but it's back and as good as ever.  Glad I did it.  It was a few hundred bucks but it'd be very expensive to replace.  

It depends on what's wrong with it.