I have an X6HR, so far it has been good to me. I can track my runs on a computer and compare my heart rate and changes in altitude so that I can chart my progress. I like the watch very much and it is quite smaller and lighter than the Advizor or the Vector. The manual is quite thin, the phone uses a cell phone style operating system that makes navigation a cinch. I recommend it, but then again, I'm not one with the "real world" experience you may be seeking.
Here's some info on the mil-spec suuntos-
http://www.miltoc.fi/pdf/Military_catalogue_sis_qxd.pdf
P.S. The x9i eats batteries for breakfast, "Power: rechargeable Li-ion battery. Battery life: 4 to 5 hours (1 second GPS fix rate)/12 hours (1 minute GPS fix rate)/2 weeks (manual GPS fix, >500 locations)/2 months (in time and alti/baro modes)" (
http://www.forestry-suppliers.com/pr...e.asp?mi=3635).