The best thing about conversion alert is that it provides the information in real time, this enables me to make timely decisions and act accordingly. I like how easy it is to use and customize my dashboard as per needs. It's free for most plans but paid version has more features which are quite useful while monitoring traffic sources. Sometimes you have to wait few hours before getting actual data from google analytics. So if you want immediate feedback then go for free plan otherwise consider paying option. Real-time tracking is what i am looking for when using this plugin.