I have a Garmin and love it.
My Grandma (bless her heart, I love her but she doesn't know much about electronics) got me a Nextar for Christmas. From what I've been able to learn the maps are from 2005. It updates slowly due to the relatively slow processor speed. And, from what I've been able to read up on, good luck calling tech support. They don't do tech support.
That being said, I put it in my wife's CRV and she seems to actually like it. It's been pretty accurate so far in limited use, but for me I want the best if I'm driving around in BFE Tennessee and Kenucky's hill country (cue up 'Dueling Banjos')!
Good luck, and let me know if you find a way to update the maps.
Solar yellow '04, 4" OME and all ROKMEN arms, Currie HD Steering, Alloy Axles, Nth Tummy Tuck, Currie Antirock, and Skid Row Engine Skid, Tom Woods, WARN winch, ROKMEN Rocker Guards, Power Inverter... Retired for trails and fun! Most importantly PAID OFF!!!