I have a strong fondness for the Specials and this is an album I absolutely loved when I was 17 years old. When I was working my first job in high school, at the local library, my boss handed me 3 old records from her collection because she found out I started collecting vinyl -- London Calling, the first Madness LP, and this. (What a generous gift!) My bestie named his first car Rudy after this record (and "Rudy Can't Fail").
Of course, as a suburban kid in the 90s/00s, my knowledge of ska was mostly related to the Tony Hawk Pro Skater soundtrack and the Warped Tour (as others have said, third wave ska is "the sound a kid hears in their head when they get handed a plate of mozzarella sticks"). I still have a certain fondness for that era of ska-punk, but it felt incredible to find out about the immediate "roots" from the late 70s (it would take a few more years before I figured out this was only the second wave and not really the origin of ska, but that's another story). It lent a strange credibility to some music I'd been listening to since age 10.
The record itself is fab and I didn't totally understand its impact until I took my first trips to London. You could find 2 Tone singles at nearly every charity shop, which felt like an incredible score. I then came to understand how this movement was (almost) on par with the Motown craze in the US. The proliferation of ska into pop music, as modeled by the Specials, has a wide, deep, substantial effect if you listen closely.