What phone do you own? I have a galaxy note 2 with roughly 14gb of music and 150ish contacts and I am able to make phone calls and immediately play music from my phone. I also have an 8gb flash drive plugged in that I play music from instantly.
I have no issues with the cue and love it.
Also note the dealer gave me a car to take home over weekend prior to purchase. This car had major cue issues, where as my phone whereas my phone would not stay connected via Bluetooth.