It’s surprisingly effective for what is basically a Web container, although it is worth noting it doesn’t work very well if you try and install it via Firefox.
My biggest issue with it is that it doesn’t run quite as well as a native app, because it basically runs inside of a browser, which might be something to watch out for if you have an older device (and if you have an old iDevice, it doesn’t work at all). It might end up being unusably slow.