The only problem with their SSH agent is, if you store let’s say 6 keys and the server is set to accept a maximum of 5 keys before booting you, and the correct key happens to be key number 6, you can end up being IP banned.
This happened to me on my own server :P
That being said, my experience was using the very first GA release of their SSH Agent, so it’s possible the problem has been sorted by now.
They removed that feature, at least for Finnish.