Yes basically condos are a bad investment due to maintenance issues, landed is better but security is an issue, G&G is good when new but as the development gets older, there are doubts, also did you guys not read the news that some of the security companies guarding the G&G properties in KL were actually run by triads, they clashed over contracts and they were so bad that the residents were actually paying protection fees rather than service fees.
As for security systems, I already am quite a specialist in securing landed property, my landed property in Singapore is well secure with a security company, any breach and the security company is informed, I also have IP cameras which can detect motion and start recording as well as alert me via alarm to my mobile phones, so even when I am overseas, I can still be alerted to any suspicious activity, for Malaysia I would add loud alarms as well as flood lights in the event of security breach, this would alert the whole damn neighborhood of a break in and can be disarmed remotely using Internet, BUT nothing can stop the lowest tech break in, walking in and holding you up at the gate while you are entering the gate while driving in, or simply pushing open the electric gates while you are in and the alarm system is off.
Sorry I sound paranoid but looks like the only solution to mitigate this, is to live in a condo, which does not seem to be a good proposition for dumping my money in.