I tried it on two PCs.
On the first PC (Desktop) I could not install. It immediately caused an error and the installation stopped.
On the second PC I could install and it rally worked for a while. Then suddenly I got problems. I could not any longer download files from Internet - expecially ZIP files (From the IE not in BufferZone !!). After a reboot I could downlaod one time und when I started the ZIP file the Windows explorer crashed.... And this again and again.... I tried to install WinZIP (now I could decompress ZIP files but still had problems downloading files. I removed then WinZip and finally also BufferZone..... And immediately after deinstalling BufferZone downloading worked again well...
Conclusion: BufferZone is much better (and also a little bit faster) than SandboxIE. But BufferZone has too much Problems, so I have to go back to SandboxIE