or if they live in the Mountain West and you're not going to get 1x or 3x connectivity. Go look at a coverage map.
I use my droid heavily,
Lookey. Here is my navigation stand and everything. I use it alot in the city even when I don't need to, because it's fun.
I love it. But, as I stated, I'd want a dedicated GPS for long haul trips. Does your provider give you unlimited European coverage? Mexico (CDMA)? I'm assume you "unlimited is unlimited" guys are Sprint. I've been through the Unlimited wars before. If they can't offer unlimited cable internet access then.... it's just a matter of time.
I've gotten calls while the navigation was barking out directions. That's a pretty distracting business call when you're running late for a meeting.
If I'm flying into town for a beer festival and minimally driving, sure, I'll skip the Garmin. But If I am driving from Phoenix to Denver, then you can't beat a Garmin. It's not like they moved Durango or re-routed i-17 in the last 5 years.
The Garmin is much easier to load in multiple locations too.
Fixed cost for a Gamin is $200 ish, I think the minimum buy in for a GPS enabled phone is about $2250 for 2 years.
Again I have both, so. that wasn't an issue.