No gimmicks, inexpensive well made strings, good tone, they hold well.
Feel. They don't feel weirdly slippery like new Ernie Ball's, not as harsh on the fingers as some others.
Inexpensive without being cheaply made.
No plastic packaging, which I like but means I'm not buying in bulk (good for the environment, bad for long term storage).
Tone is just the usual nickel on steel.
They rust about the same pace as D'Addario's imo, which is normal and fine. As usual, just remember to wipe your strings after playing and they'll hold twice as long.
Hybrid sets are great! I wish they also did balanced tension sets like D'Addario though.