To be honest i bought Asustor because it was cheaper than Synology. I had Qnap before for a few years. I just want to share my biggest regrets:
1. Mobile apps are outdated and haven't been update for long time for iOS.
2. no decent DLNA client. Twonky is not included. Others like miniDLNA and v2 UpNP are so so.
3. Plex support is so so because overtime you update you need to restart service.
4. When you update you need to restart services
5. VPN configuration is so so and PPTP doesn't perform well.
6. Time machine for Macs get corrupted all the time.
7. Download app for mac hasn't been updated for ages.
8. There is no full backup capability as like one touch backup to external drive to external drive like i mean full backup
Overall everything seems and looks like BETA