Excel can be quite a useful too for a plog, if the user knows a little about excel.
These days the headings and timings on my plog are just there to keep me honest in case something happens to my pda gps.....I should be able to continue without too much trouble.
But back when I was DR'ing around the country relying on my PLOG for headings and timings, I can remember a number of occasions when I read the wrong figure off the PLOG (flying speed as heading for example), simply because it's layout didn't suit me (some of these mistakes were repeated, and I needed to do something about it.) The benefit of Excel is that you can quickly change the layout of your PLOG to something that suits you.
In my case, a simple change of the format, and these mistakes instantly disappeared.
dp