It's only secure when used with TLS 1.1+ where it has an effective security of 112 bits. Otherwise it is susceptible to the BEAST attack, like any other CBC cipher suite, unless the client has been updated to mitigate the attack.

Actually just had this conversation with someone about setting up a new https setup for hosting a tool and the amount of online "guides" that still reference 3DES (when other options may be more suitable) is impressively high. Yes 3DES is still "secure" in situations but other alternatives are preferred when we can take them.

It is secure, but it is much slower than AES and requires frequent rekeying because of small block size.