I had XL Nickel Wound rounds on my Spoiler before the DR Low Riders (steel) that are on now.
According to the Tone and Feel Spectrum Chart printed on the back of the package, the ProSteels are Super Bright for tone and Textured Round for feel, whereas the Nickel Wounds are between Bright and Super Bright for tone and Normal Round for feel.
I wouldn't call the nickels terribly bright, but they kept a clear tone for a very long time. They became a little dull in the end, but still useful.
I would guess that if they label the ProSteels as Super Bright, they will be just that. They might become dull quicker than the nickels, and the question is if they'll still sound useful.
You can get just about two sets of D'Addarios for the price of one set of DRs, so you can change strings more often.