Basically it greatly shortens the time needed for a wine to breathe so that you can drink it right away and enjoy the intended taste. I know of a number of wineries that use it when pouring their wine samples for prospective customers. I cannot comment on the wines to which you mentioned.
It depends on the wine you are drinking. Some friends brought over a nice bottle and there was some sediment and it did remove it. I think you should use it because you don't want the sediment in you glass or stomach... However it is very easy to remove.
I have used the aerator several times and I tell you it takes the harsh edges off of wine straight from the bottle. I love red wine but rarely drink it because I am impatient (I don't give it an hour to breathe) and cheap. I find you need to go into the $15+ range to get a really drinkable bottle and I cap my expenditure at $10/bottle. I feel like this helps in making a cheap bottle drink a like a higher priced bottle. You can really get the bouquet and flavor and not the harsh tanins and alcohol bite. Hope this helps.