The repeater reproduces the name of your network: you will see then that while there are two.
And concretely, what improvement?
I am the first, at the other end of the house (Box numéricable) and I get normally between 0 and 1 bar of 4, either on my iPhone 4S or my Android Wiko Cink Five. The laptop is barely better.
I did a test with the Wiko (speedtest.net) and upload it's almost 5 times faster now, with a signal to 3 or 4 of 4 bars.
In short, it works exactly as one would expect.
The manual is in color with pictures and very well done. It is in English but with the explanations I have just given you should be fine.
PS I just ordered a second but on ebay because a lot cheaper.