It takes a bit of fiddling to log onto a hotspot the first time (try turning wifi off then on again), but after that it is seamless. It is great to have a map at your disposal.
Some people complained about needing to be close to the hotspot, but that is location dependant and probably set by the retailer so you have to be in their (e.g. coffee shop) location to use it.
I especially like that I can turn it off and on in my iTunes subscriptions, and can use it with all my devices.
Dan1867 about Boingo Wi-Finder, v5.5.0005.0