What do you guys think of this?
http://www.tunabellysoftware.com/tgpro/
Is it a worth having on your system?
I like it. It shows temps of all components and records maximum each component got in an easy to read graph/chart. Its customizable for how it looks in the menu, what you want to measure, c or f, fan speeds, refresh rate, notification pop ups, email alerts, etc etc. You can also log temps, fan speed, diags, etc.
It has a fan control I like too. You can set the percentage of fan you want for any and all components at a set temp and how gradual you want the fan to come on from 5 seconds to 1 minute.
So for example 80% fan when CPU is 80c, over 1 minute of time. So when the CPU gets to 80c the fan will come on and slowly ramp up to 80% over the course of 1 minute. So if it satisfies that call for fan it slowly revs back down. I really like that because I can have the fan actively maintain a temp without the fan being obnoxious.
At anytime OS X will override it if it needs too. So if it needs 100% fan immediately it will do it. So there is no need to worry about messing anything up. I verified this with games, I can not get the fan control to let something exceed the temps of the limits already in place by OS X.
Here are some screen shots.
Menu Bar
Drop down menu when you click the menu bar
Main Window, the lines passed the temps are the recorded maximums scrolling your mouse over them highlights it.
Preferences, can select what info you want to see in the menu bar
Fan control preferences, you can add anything and everything to this.
That said I never really messed with any other programs. They could be better, and there are certainly some free options out there. BTW ignore ambient sensor thats my iMac.