Appreciate the info y'all. I now see where they are the best (shipping very large packages). I noticed on their site that they also have very generous package size limitations.
I also got re-reminded of what a friend of mine just told me today. When shipping 2 or more of the same type items to the same place, the price goes up very little. I recently priced 3 heavy engine parts to Texas and the USPS had the best prices at $108 total. I just checked on what it would be by Greyhound and the price was $60. By one item the USPS will beat Greyhound, but what a difference with multi items.
Guess I'll be checking with Greyhound more and more. Even tho, as mentioned above, you have to go to the terminals, many times it looks like it will be worth it.
Thanks again.
Bill