The user interface looks great but you need to have some technical knowledge or hire someone who does understand it well because there are many more options than what I used before! It's definitely worth trying if your looking at other systems like HostelBookers/Hotwire etc.
There isn't much we dislike about sirvo so far - they've been really helpful throughout our relationship. We use them primarily for bookings within London however their international services do work too once again good value service compared others out there.