Sidekick doesn't particularly WOW me. I've used this software since it's inception and used Network Location before that.
Sidekick is fairly handy, has a nice interface, and the customer support is excellent. However, most of the actions you would actually WANT this software to do, it does not. For instance, start/stop the firewall, start/stop file sharing (sharing anything actually), swapping the dock applications, change the browser homepage...etc. I understand that there are some security risks with many of these items, however I believe users are willing to accept the risks.
Sidekicks good points are that it has a few pluggins available and are integrated well. Adding more would put it over the competition. Additionally, the developers are quick to respond to questions and usually have gotten back to me within 24 hrs. Really though, you won't need to contact the developers as this software is fairly stable and reliable.
I like Sidekick... I just don't 30$ like it. Check out: Airport Location - a very powerful, but somewhat unstable alternative OR Control Plane. Both are free and generally do the same thing as Sidekick, if not more. Their downfalls, like I alluded to, are stability.