Velodyne VA-1512 vs. current model subs

Can anyone tell me what I would expect to hear differently with a more recent model sub like the Polk PSW-505 as compared to my 12 yr old Velodyne VA-1512?

I know the Velodyne was rated decently back then, but I'm trying to figure out whether the playing field has changed much in the last 12 years or if I should be happy with what I've got.

FWIW, I use this setup with Polk Monitor 70s for mains for HT and music. Thanks.