Summary: I've worked with Drobo, Promise, ReadyNAS (no QNAP), and the Synology DiskStation is by far my favorite. I also have a few of the DiskStations at work. I've even recommended other co-workers get a DiskStation since I like them so much. This is the second one I have purchased for home. I primarily use it for backups. Yes, I even RAID6 my backups along with online backups.
Summary: Installed 12x 4TB WD RED - SHR with 2x redundancy + Hot spare = 32.7TB total. Synology NAS's love talking to other Synology NAS's and its very easy to setup UPS server and auto-backup solutions among the family of five Synology NAS's I have.
Pros: Easy to setup and manage - Well built and has loads of features - Simple easy to use UI.
Cons: The drive bays don't have a positive snap like on the DS1812 Model - Installing drives feels a bit flimsy.
Summary: Happy with the purchase. For the price, one could build a freeNAS box that resolves all of my Cons if you want to invest the time and effort. Otherwise Synolgy provides an all around good easy to use NAS with all the software that most users would want.
Pros: Been up and running 24/7 with very little downtime for 6+ months with no issues. Filled with 10 3 TB WD RED drives and 2 old 3 TB Hitachi drives i had laying around. Added the DX1211 expansion box a month ago along with 4 WD RED 4 TB drives. Being able to simply expand the existing volume is great. It took a day or so to expand the array, but the process was easy.
Cons: There is a port of Plex server available and it runs fine, but the hardware is not powerful enough to support transcoding.
Summary: See Vernon A. Miller's post, he sums up this monster quite well. My only minor quibbles about the case is maybe a little filtering and a little more active airflow with a larger fan. DSM can be a little slow responding to commands at times. But otherwise this thing is a monster and its fast and reliable. Mine has 8 4TB WD Red drives, two in RAID 1 and the rest as single drives so far. As I can afford more drives I will start redoing the RAIDs.
Summary: This is an amazing piece of equipment. If you have a small design studio with a half dozen or more 2-4TB disks on a network, each one requiring attention, organizing and a set of folders, not to mention backing up, this will take your 5-10 drives and make them into a single addressable drive that is incredibly efficient at backing itself up RAID style.
Summary: I started my Synology habit with a DS1010+, then sold that and got a ds1511+...but when they announced the 2413+ it was time to go get one. I have populated it with the WD Red 3 tb drives. After a year, almost, it has been running great. I did lose one drive last week, which oddly didn't give any warning until the system said the raid had degraded. Easy process to get it rma'd with WD. Took about 3 days to rebuild/verify the raid but didn't lose any data.
Summary: First of all, pardon me for the length of this review. This is a complex and expensive product, and I wanted to do it justice. Just so you know where I'm coming from; I work in the computer storage business and have for most of my career. I currently work for a business that makes enterprise-class storage arrays. So I'm "into" data storage :-) I bought my first Synology disk array three years ago on the advice of a co-worker.
Summary: This is much better than I expected. Very quiet. Great UI. Regular updates from the manufacturer. Very fast disk reads/writes and network performance. Significantly better than the ReadyNas line I replaced with this unit. I've deployed this with the WD4001FAEX 4TB drives. I'm very happy with this combination.
Summary: This is the 3rd one I bought. 1 per year. Not because they break, but because they work great and as our needs expand we have come back to Synology time and time again. For the best details just go to the Synology site to log into a test unit and see all the features for yourself. With this model we get 95+ Megs per sec on read and write using single ethernet. In environments where you have switches that let you multiplex or bond it will do close to 190 Megs.