What are you using the roosters for--breeding, eye candy, music??
Do you have a place to keep them for a month or so--away from your girls? You will want to quarantine them.
Do you have roosters now? Will there be 'war' on the new roos??
I think others will need these answers before they can answer your question.
Unless I had LOTS of laying hens I wouldn't trade my girls for a roo! If I needed/wanted a roo, I would just purchase the one I wanted.
I got my pullets at 18weeks old and it's been a long haul getting them to a laying stage, so these egg layers are like gold to me...this is just my humble opinion....