How does this compare to Sysinternals’ Process Explorer?

I would say that it’s pretty close, except the one thing that I find really nice is that this will also show you which applications have a lock on a specific file. Previously I’ve used Unlocker to perform this task, but it’s nice that it’s included with this program.

Very true, but as I mentioned in the previous response the Performance Monitor will not let you kill an application that has a lock on a file. So this does have a little bit of an edge.

perfmon or perfmon.msc

“Allows freezing individual Windows processes”
…windows task manager has had that since at least as far back as Win2k.

Only interesting feature I see is “Displays information about applications that utilized most of the CPU or memory at any time presented on the charts”. But not quite interesting or useful enough for my purposes to install this.