I'm kinda one of them... I can say other than the promise of VoLTE and it's HD Voice I don't need "4G" speeds. Last speedtest I did on my phone worked out to about 5Mbps (on AT&T with SGS2) which is plenty as I don't try to view "Full web" on my tiny screen phone. I prefer mobile sites or apps to give me just the information I need rather than tons of apps taking up space.
My "Faug G" speeds are more than enough for now anyways, maybe for a Tablet or something i might want faster speeds but my phone, i'll take the lowly HSPA+ versions of phones vs the LTE ones which suck battery like a vampire at prom!