It's probably about the similar size to SYD T1 J Lounge. Feels a bit brighter. Products are Aurora, which aren't that bad (better than Kimberley Clark). The shower head is not a rain type, but a mounted, loose shower head type. Water pressure could do with a bit more for Western standards.
I can't quite remember the hot-cold water dynamics, but I think (not sure) the hot water may need to be turned to full blast to be suitable for those that like a hot shower. (Hey, this is Singapore; it's sticky like a bain marie out there, cold water showers are ideal!) That said, I think if you steam up the entire room, it might take a while to clear, but unlike some other lounge bathrooms (or hotel bathrooms) I've been in, you won't suffocate to death.
I wouldn't sing in the shower. Not that you may not be heard, but it's just odd as in public facilities!