360 TS works fine for me, with no issues and is lighter than most other antiviruses. While it receives very regular bug fixes, which would suggest that it is a very buggy product, I've actually never found it to buggy. It has minor issues with false positives, which is not a big deal, as it's very easy to whitelist files, unlike with most antiviruses. If the realtime protection detects a threat, I am given the option to whitelist the file. If I download something suspicious, it is automatically quarantined. But, I receive an alert, which gives me the option to restore the file from quarantine and whitelist it. I really wish that more antiviruses made it easy to whitelist files.
The only major con for me with 360 TS is the ads in the free version (although they can be blocked). This is why I am a paid user.
Yes, the cleanup modules are not needed. But at least they are safe to use and work very well. When 360 TS was first released I didn't like its cleanup functions, as I found it to be too aggressive in what it wanted to disable. For example, it would want to disable the scheduled task to create Restore Points. However over time the it's become less aggressive with regards to what it wants to disable.
I've got both IObit Malware Fighter 8 and Bitdefender installed on my test computer. When doing a manual scan with both a very large collection of malware and a large collection of PUPs, IMF detects more threats in both cases. If tested against new malware, quite possibly Bitdefender will do better and I'm sure the behaviour blocker in IMF is terrible.
While 360 may not do as well as Avira itself, its own signatures are excellent. If you have a look at Virus Total scan results for threats tested in the Malware Hub, usually 360 is one of the very first antiviruses to detect new threats, along with ESET and Kaspersky for example.
360 Total Security/essential and Comodo Firewall not only play nicely together, but they use less than 100mb of ram on idle and that is total combined between the two programs. 360 Total security only uses 50-60 mb of ram on my computer. In comparison that makes 360 total security/essental 4 times lighter than Fsecure and 2 times lighter than Fsecure when using Comodo Firewall with it.