THEMI and WinPilot thermal centering reviews?

I googled this topic and found a few threads...but
nothing to recent. Anyone out in cyberspace want to
provide input from *actual* use? I am not intersted
in started a flame war over the 'purity' of using these
devices. Just curious as to how they have worked out.
I drop waypoints into my GPS on occasion when I work
a blue thermal that is on my return course...but other
then that I use the conditions outside the cockpit
to hunt thermals. I noticed where WinPilot now has
a means of evaluating multiple flights to determine
ahead of time where thermals may be...sort of a refinement
of CH's project.