I also use them as wallet. They are the oldest faucet online and are still paying with a very active admin.
I know that they still pay out, but im just wondering how secure it would be if you store lets say 10BTC on there? Thats more than 40,000$ right now but you would get a nice interest on it (for me its more than i would get if i let it sit on my fiat money bank account).
as always... don't put all of your eggs in one basket.
btw I have a question, some users has asked it but not been answered yet (I've searched this thread)
can we change the email address on an account at will? whether it's still valid and/or we have no access to that email