HI RNF
My son brought me a similar on glass wine aerator, rabbit swish see at this link.
http://www.petersofkensington.com.au/Public/Rabbit-Swish-On-Glass-Red-Wine-Aerator.aspx
Yes wine is improved with aeration, I did a heap of testing and found with a freshly open bottle the aerator did improve the wine but made no difference after the bottle had been open for a while.
