...I don't think, in this day and age with all the amp and pedal options we have, that it will make any difference to your tone. We've got much more control now over our sound. When EC and others first yanked the covers off their humbuckers, they were going for treble treble treble in order to cut through the 'mix' they heard in the early p.a. equipment available at the time. Hence EC's 'treble booster' he played through. Now we have controls at our feet that the early pioneers of the 'woman tone' could only dream of then.
So, covers on, covers off, to me it's only aesthetics. If you want more treble for your solo, set up your EQ pedal accordingly, and step on it when it's time.
once again the Colonel speaks the truth. i hesitated to put chrome covers on my '82 Norlin because i've done it before on another similar guitar and it did change the sound. but i figured out i could eq it back, and it did after some dialing in.
they're just pressed in, no issues.