Flents Quiet Time Comfort Foam Ear Plugs - 10 Pair

How many times should the ear plugs be used before disposing of them?

This may be a silly question but how noise proof are they? Will I be able to hear my alarm clock?

A reviewer from 2011 wrote they had changed the design and it is is worse. so is this now back to the original version before that change?

How are these any different than the other purple ear plug shown here https://amzn.com/B013WI9188 ?