Is it safe to use iStat Widget?

Hello people,
I just got my first iMac and I love it and downloaded and installed the usual things, I was using when I was on Windows but I see a lot of people in the community saying good things about pieces of software like iStat, the widget and I'm wondering if its safe to get it.
Can it cause any damage or so on to the Mac, in any way like viruses or other malicious things? I was very careful on Windows because I wanted to stay as safe as possible and was very careful with what I get over the Internet and I'm still a bit paranoid about all the viruses and other malicious stuff from the Windows platform.
If anyone can give me a bit of feedback on the personal use of the Widget iStat,and if its trusted to be a legit piece of software it would be greatly appreciated.
Thanks and all the best.
