Yes it does matter in real world scenarios, because the point is to prevent malware infections And tightly configured SBIE should be tested, not SBIE with default settings. None argues this, however in SBIE you have betters means of control, on what can start/run and what can have internet access-by default Chrome beats SBIE, but tightly configured SBIE beats down Chrome (even if it's tightly configured, since it does not have a wide range of control on SBIE's level)-when it comes to security. When it comes to security nothing is redundant, but you have to look up for simple solutions not complex ones and SBIE is pretty much all-in-one package since it has many configuration options-that's what makes it better than Chrome. The only thing you need with SBIE is good quality firewall. I have Edimax router with SPI+Firewall both enabled, tweaked on maximum level, plus Windows XP firewall block everything incoming/outgoing, tweaked on maximum level. The only other thing I use is removable drives write-protection with small NoAutorun software application as well, just in case.