Aww, Charlie enjoyed the Silent Runner. I can tell how impressed you were with it. Like you say, it was harder to get larger wheels then.
How cute that youtuber made the Tic Tac wheel floral.
I hear Nightangel wheels are really good. I was going to get one but then thought the Tic Tac may be better.
I imagine the Silent Runner is not easy to clean but I am guessing Robo's feel safer in them. I may be wrong, of course.