Long answer, with the usual caveats :-
There are two aspects of safety to consider; Privacy and Security.
Obviously, the policy does not apply to the idiots who occasionally try to scam us and our users!
We work hard to keep the J2Ski servers secure, and regularly review the software we use. We were one of the first major ski sites to go "full time SSL" - to keep your details safe!
You can check how we're doing by running an independent test like the one from SSL Labs, who gave us an A+ rating last time we checked.
You can run the test yourself using this link :- https://www.ssllabs.com/ssltest/analyze.html?d=j2ski.com
We recently posted a discussion of our security here - How Secure is your favorite Ski Website?