I've been using the Spy Sweeper 5.5.7 build 124, version without antivirus, for quite some time. Today I was offered a new version, 188.8.131.52. I have no idea why they went from 5.5.7 to 5.8. First I created an image in case I wanted to 'go back'. Let's differentiate between the version WITH and WITHOUT antivirus. I'm using the version without antivirus. I use Windows XP. People tend to complain about bloat, but on my computer SS has never been bloatware. However, it's possible that this new version uses a bit more memory, but not much. I may not use SS like the average user, there are quite a few things worth configuring and examining. I also manually load it at startup. Warning: unless you use a customized install you'll probably end up with the ask.com toolbar (a despicable practise), I think it's opt-out. You can also become a member of the WARN network, somewhat comparable to ThreatNet of Counterspy, but if you want maximum privacy, opt-out. The default on installation may be opt-in. (Don't forget to customize!) I'm not pleased with the new GUI, I don't like the colors, but that doesn't really matter. What is also new: a gaming mode, and a 'sweep for masked files', whatever that may mean. So far, no problems.