Not usable
The first few days the app worked well enough. It was slow, too slow, but I was more than happy to accept that for offline reading. At some point it simply stopped working. When Im not connected to a wifi network, it tells me to connect to one in order to use the app. The whole point of the app for me is to be able to read Safari books when I dont have a wifi network in reach. I cant say whether this bug is restricted to my device or more wide spread, but given the bugs from the first version and now I can recommend this app only for beta testing and not for widespread use.
Stefan Zapf about
Safari To Go, v2.0.4