I Bought a Rad Mission a few weeks ago. The single Speed is a trade off. On one hand you get simplicity and less equipment that needs to be adjusted and less weight. The downside is when pedaling on a steep incline you will have to put a considerable pressure on your knees and the drivetrain and use full throttle. On moderate inclines it's not a problem. On declines or when going over 18 MPH your pedal cadence will be faster than desired with the single speed.
Something to consider: Will you be biking on lots off hills or mostly flat terrain?
If you want a very similar bike with 7 speeds, I would look a the Ariel Rideal.