Just a heads up, tshapiro pretty much hit the nail on the head.
Every Samsung phone that I've tried (on sprint) from the Moment to the Epic touch, have horrid GPS in comparison to anything. I would, and will, definitely second the notion of having a backup plan if you need an accurate and reliable GPS solution for traveling/getting around.
I actually chose my Evo 3D over this for this exact reason, and stability (though the touch doesn't bog down like the original epic does, thankfully). Personally, if it weren't for this, and slightly weaker WiFi, the Touch is a MUCH better device in my opinion.
The speaker is better, GPU is stronger, etc. Its just lacking in what I need.
Summing it all up; the GPS sucks, period. Takes far too long to lock, and is inaccurate when 'locked'.
As a comparison, my 3D gets a lock within 8-15 seconds, and is down to 6ft accuracy within 30 seconds, whereas a touch right next to it is starting to lock on 45sec-1min in. Accuracy never more than ~300ft.