Curious mind here about taking them off. If the fit is "very tight" is it so tight there's a danger of pulling the IO6 apart which has happened to a number of us when one of the Silhouette tips get stuck? I was waiting for some feedback about this from users before spring for 1 or more of 'em.
I just took it off of my 6 month old io6 without an issue. The o-rings are a little more forgiving than the plastic of the Silhouette tips I believe. Twist clockwise and it comes off without an issue.