So, you want a review and if theses are worth it?
Stop thinking and buy them! I have 49 pairs of headphones and theses are easily in the top 5.
Koss is my favorite headphone company second only to Sony and ultrasone. The sportspro clearly had thought of everything with this.
I'd recommend buying a aiwa throwback, take the earpads off and slide them on the sportapro.
Portability:10
Sound: 8
Design: 10
Comfort: 10
Practicality: 10
If I had to use one headphone for the rest of my life, it would be the sportspro.
Cons:
The cable is thin, but isn't a complaint for 30.00. I wish it was replaceable.
Oem pads are kinda small, people say the yaxi pads help, but just go to Ollie's and pick up a Aiwa Throwback for the pads.
Wish it had a screw on plug for a 1/4 auxiliary connector.
Tldr; buy them. They sound amazing and will last a lifetime with the warranty.