HA! that looks awesome. Somewhat similar in looks to the LG Glance[1] that I had as my last "dumb-phone". Of which, I will say I loved the ergonomics, battery life, and durability of that phone. Honestly, the only real data function I require on my phone these days is maps... I would be very tempted to drop the data plan on go this direction. A bit pricey though, I would still probs go with a $25 phone over $150 anyway....
No. I despise turn by turn navigation. With the passion of 1000 suns. and sometimes I'm not driving, sometimes I'm just walking around a city looking for the nearest subway station. Granted, paper maps will get me 70% of the way there, and I do look at googles turn by turn readout, and view the entire route on a map. But I refuse to succumb to those shitty navigation systems. I want to look at a map, a suggested route, and make my own decisions on what course to take. Also without fumbling around for 20 min just trying to plug in a specific address when all I have is a general idea of the area I'm trying to get to. I don't even need gps on a phone, I usually know the general area I'm in, or I just use cell tower triangulation.
I have a prepaid dumb phone. I also have a Samsung Galaxy S4 with no cellular plan. I use OpenStreetMaps with GPS turned on. I can download the state I am interested in while on WiFi at home. Then I can navigate anywhere using my phone's GPS without even having a plan. I travel cross country on my motorcycle, and use turn by turn directions via my headphone while listening to pre-recorded music.
[1] image: http://i-cdn.phonearena.com/images/phones/16040-large/LG-Gla...