Astaro is excellent
There is a lot of misconception in regards to security due to security vendors and their marketing.
The truth is, there is no magic pill in regards to securing your network. You don't just install Product X into your rack cabinet and your network is "secured". Behind all the marketing of security companies, real security comes from the sysadmin who has to enforce the security policy. As someone who does IT security for a living, what Astaro has done is put together a comprehensive security toolset buit from OSS that is EASY to admin and enforce the policy. There is no wonder they were awarded PC Magazine's Best Product of the Year for Business Security Solution. I've recommended the product to my colleagues in IT security and they all love Astaro.
If anything, Astaro should be considered a Linux/OSS success story, and I would recommend it to anyone.