Motorola i730 / i733 / i710 / i720 / i740

I'm with verizon right now but seriously considering switching to Nextel and will probably get the i730 since i know someone who has that phone it has been working for him very well. my profession is heavily involved with geographic information and the big thing i like about the i730 is that i can use the GPS and if i want, download trimble's program for it to make it a true handheld GPS (from what i've read). anywho, i just wanted to know if anyone on here has used that program and what they have thought about it. thanks