I love that fact that Sophos Safeguard Encryption is applied to the entire hard drive and not just to a specific file or folder. I have to physically enter a password to just start the boot process. I live with the peace that if my laptop is stolen, all of my data is encapsulated with the vault that is Sophos Safeguard Encryption. Whilst in operation, you don't even know that the software is there and protecting you in the background.
When I first started using Sophos Safeguard Encryption, I had a normal hard drive. The boot up time of the computer was incredibly slow, and functions within the operating system were also much slower than compared with a non-encrypted drive/pc. I upgraded to a solid-state drive, and away went all the speed problems. Other than the speed, the only other thing I dislike is the logon interface which pops-up before the PC starts to boot, I feel this could be a lot nicer, and not as plain as it is presented (but this is obviously limited by graphic performance in the boot sequence).
If you do decide to go with Sophos Safeguard Encryption, having hardware that uses a solid-state drive is really a big plus, then you will never notice any performance downgrade.
The business problems that are solved by utilising Sophos Safeguard Encryption are very obvious; your data is full protected, and the failure is single point if it ever does get out (being based on a username and password). Stolen hardware is no longer a concern, as the thief will be unable to access the computer, nevermind the data.