I have this system, it can be useful to pick up WiFi from further than you could without it but it does have limitations. As Loz says, it will not make crap networks good, it just makes it a bit easier to connect to the WiFi component of it. If there is a login, even free, you have to login to your iboost router gateway and enter the details it needed.
I got mine 4yrs ago, mainly to use in Europe, but I found free WiFi , away from city centres, was v rare and I can count the number of times I used it successfully since then on two fingers. 3G/4G has become so much more available and cheaper since then, esp with the changed roaming laws, that I just use that. Yes there are areas where there is no mobile signal, but there is usually no WiFi either.
The only scenario it has worked was a uk campsite where the WiFi is at reception and your pitch is far away, but even then it only makes a small difference, and other vans, buildings, undulating land etc will still stop the signal. I would say it wasn’t worth it, but that’s just my circumstances, it may work for someone else’s scenario. A mifi type mobile router would probably be better value and more useful.
