The best feature is that it provides us with all needed information to handle our properties in one place! I haven't encountered any problems so far, but if there are some - we can easily solve them by contacting their support team.
It's not free for small companies like ours (we have only 2 employees), however this doesn't mean you shouldn't try out their products before buying anything else. We use the system both as an online hotel reservation software and property management platform. With fiLDev, users receive real time updates regarding bookings from hotels around world via SMS or email.