I have been working with Voodoo SMS for over a yea...

I have been working with Voodoo SMS for over a year now. I have had a good experience overall. The registration process was easy and straight forward. We used their API in our Garage Software, to send SMSs to customers to remind them of their upcoming MOT expiry.
It works very well, and their online dashboard and platform is seamless allowing access to tins of reports to monitor usage, and status of messages sent.