@property on free function for UFCS?

[rcorre via Digitalmars-d-learn]

On Sunday, 14 June 2015 at 12:36:43 UTC, Adam D. Ruppe wrote:
> You can use @property there, but you don't have to because you 
> can call it with optional parenthesis anyway.

Thanks.

Is there a good reference for the current state of @property?
I know it was hotly debated for awhile (and maybe still is?).
I'm just never sure when I should be using it (if at all).