I used cape for a while - they had a promo where the service was cheaper. I'll be honest, the service itself - the signal I got on the device - was just not worth the full price of $99. It could just be my area. I also had to constantly turn voicemail on and off or else I wouldn't get voicemails.
The customer support team was great to work with and actually extended the trial price for me. But ultimately, the service just does not seem competitive on a usability level with major carriers and this was an issue for me. It very much could have been my local area but Verizon and T-Mobile are far, far more reliabl and comparable in price.