I've had a great experience after 4 months with Back Office. Their approach and services have been top notch, with exemplary follow up from them regarding questions and requests. Edwin, Jackie and Ralph have done a great job ensuring that my accounting needs are met and that I'm taking advantage of the services as we scale and execute on our financial strategy.
I can't help but feel a disconnect when reading some of the other reviews on here but also understand the subjective nature of this process.
I'd recommend these guys (and have!) to colleagues / friends and would suggest that you reach out to them to form your own opinion of their processes and offerings.