I have experienced no issues with BI5 thus far. Though my setup is fairly simple with only 2 cameras (adding 2 more soon). I definitely like how you can send alerts to multiple carriers for sms alerts. I have an iOS device so I enabled push notifications are quick and I have 2 others setup with mms notifications and responds almost immediately, soon they will use BI for android. You can link profiles in alerts on different cameras to save you time. I think that information is in the help file. I know others had trouble migrating from 4 to 5, I was lucky and didn't have any issues. I have never tried any other software so I'm biased when I say BI is definitely were the money for everything you can do as a residential consumer.