If you're trying to be "scientific" and must know to the Nth degree then perhaps not.

Luckily perhaps for me I've never had to work in such an environment as that and the tool works just fine for me. I'm not trying to do forensic analysis of how long a system has been up too often or what it's pattern of up / down time is (Microsoft monthly updates has but a squash on stuff like that)

I'm not trying to convince anyone to move over to this tool. If you like or want to do it any other way be my guest. Just mentioning it's out there and works fine (in a normal business that has to spend time and money on things a bit more important than the up/down patterns of a Server or Workstation) I agree that it is NOT a tool to use if those items are that important to you.