It's one of those solutions that just blows away your expectations. You can see when people are on your site instantly, and what page they are on. You can even block IP addresses if needed. The chat feature is also fantastic with the option to receive transcripts via email when you're offline.
We've used SmartSupp for over a year now and have never thought to replace it. The live chat is fantastic, it's smart, fast and very lightweight. You can customise everything on it, from users, teams, automatic messages and online/offline times.
By far the easiest module out there to setup, customize, and use. I have found no other module that comes close to Smartsupp. With this live chat I am able to answer customer questions on the spot! Making sales that otherwise would have been missed. Also their phone app is amazing!