As MS said, the txt file is very helpful in find your quad if you don't have a tracker, but with the txt file and the tracker, it makes it that much easier to find the quad if it is, for instance, in a tree or hiding in tall grass.
The more "tools" you have, the better!
I had a Trakimo and it was good, but at $5 per month, and the necessity for cell service, it has it's limitations.
I did not renew my Trakimo service (at $60), and instead bought a MarcoPolo since one time purchase and it is good forever.
Only limitation is the range, but like we said, you have the TXT file that can get you close, then use the MP if you can't find it with only the TXT file.
Just do it BEFORE you need it!