The four of us went to the Tai Kar last night and ordered the all-you-can eat menu. The food was of reasonable standard though not of spectacularly high quality. However, some of the staff were rather abrupt - especially when we asked for a glass of flat coke to be replaced. It was quickly replaced, but with another glass of flat coke served at room temperature, with no ice and with no apology for the first glass having been flat..
We were full when we left, as you might expect, but no more so than we would have been had we ordered a normal set menu, so the all-you-can-eat thing is for us more a gimmick than anything else. It's also accompanied by stern warnings that a supplement will be applied if food is left uneaten.
I can't see us returning.