The ease of use! It's so easy to get started with it - you can literally set up your first rule within 5 minutes or less as long as there is an agent installed at both ends; no more running out back door VPNs etc which were not only slow but also very expensive if used from multiple locations/networks. There really isn't anything I dislike about this product overall just that perhaps their prices could be lower than some other products we looked into using before deciding upon them? They are definitely worth investing our time & money given how secure they make us feel when accessing remote devices via mobile networks / WiFi connections where others would have failed miserably without any sort of encryption mechanism available.