This is something that's gone on over the the past two days or so, but I think Jakimfett (of MineChem) summed it up best with this post on his blog: http://jakimfett.com/status-report/authentication-encryption-acixs-hosting/
For those of you who don't feel like reading, it comes down to this. Acixs stores your passwords in a reversible manner. This is hugely insecure, even if their claims to have their database encrypted are true. I'm not saying to absolutely avoid using Acixs if you're already using them or if you think they're your best bet. But be aware that your passwords are stored in a manner that somebody can recover - whether it's them, or attackers. If you are going to use Acixs, use a password that you don't use anywhere else. Take efforts to do what they will not - protect your data.
For those of you who don't feel like reading, it comes down to this. Acixs stores your passwords in a reversible manner. This is hugely insecure, even if their claims to have their database encrypted are true. I'm not saying to absolutely avoid using Acixs if you're already using them or if you think they're your best bet. But be aware that your passwords are stored in a manner that somebody can recover - whether it's them, or attackers. If you are going to use Acixs, use a password that you don't use anywhere else. Take efforts to do what they will not - protect your data.