"I wish I had one of these years ago but then maybe I wouldn't have appreciated how fantastic this tool is. I can't emphasise how much I hate grouting, but this tool made it so much easier and possibly even a pleasure.
I was only doing a new shower area - about 6 square metres - but this float was worth every penny. It fully forced the grout into the joints and left a consistent finish.
One end as rounded corners, one end square, but I only needed the square ones. Large solid handle which was easy to grip.