purple mug. We were at Taka this evening and wifey spotted more suitable replacements. I ended up buying a new one for $21.90. At least this one is large enough to hold a can even when I am generous with the ice cubes. It is also much easier for my hand to reach inside to clean too.
I just noticed a design problem with the new cup: the metal side at the bottom. The older purple mug will prevent heat transfer better.
Update: The next day.
Saturday morning is a good time to test hot green tea in this new mug. Verdict: its performance against the older mug was disappointing. The exterior of this new mug was hot unlike the purple coloured one. Relatively pretty poor insulation.