k. yeah wireless is great when it works but then again it can be real picky. if you are still having problems with coverage might try a booster but you would have to have a pretty big house. Also do you have a lot of other people also connecting wireless in your area? might try changing the channel if you do. Also if they are desktops make sure the adapter is also N.
I have a range extender and it serves its purpose very well. Its been a great addition.
I am not sure exactly but I believe this is the model I have. If not, they look the same, it might just be an older model. I got it new on ebay a handful of years ago, but dont remember the price I paid. There are definitely newer (different looking) models though.