Rubi Tile spacers, any advise?

[mr.tile]

Anyone leaving them in?
I know they can cause tension, grout color fading and can attract mold. But are these any better?

They support tension and also allows grouting over, or should they be removed?

 

[Dumbo]

Don't like them I find they can twist. So not strong enough imo

 

[Andy Allen]

I use spacers as pegs on walls and pull them out before grouting....
Never use spacers on floors..

 

[One Day]

I think they would compress anyway if you used them as pegs.
I don't leave spacers in, and I use them on floors always, unless fixing really bad tiles, then it's by eye.