I set off to Pikeville, KY yesterday with my HT on, with APRS enabled, just to see how it works on road trips. I didn't have any external antennas – just the antenna on the HT, inside my truck – and I'm actually quite happy with the coverage I've gotten so far:
The downside of this was the battery drainage. My expectation is that it would drain similar to the Kenwood NX-5300 (I get about a day's usage from my NX-5300), however, I only got about 4.5 hours of battery life from the HT.
With that said, if you're not doing a lot of tetherless communications, this might not be a bad HT for you to look at and enjoy.