i was looking for a stock one but came with mine so i was like eh ill just get it.. worth it ? no imo.. the stock is fine as long its bluetooth.. most smartphones now a days have nav... if the brz had a google nav it would be nice.. but yeah the be spoke app sucks too and the b spoke unit wont bind with my GS3 only my iphone but i think its due to having a custom rom on my GS3.. the phone part works great plus i have pandora radio hacked i get it for free
im sure you can get a nice one for half the price or less on amazon/ebay