Pros: - Pretty well priced for what it is. - All of the apps in DSM are free from what I can tell so far. - Very reliable. No crashes in 5 years of use. - Can support more drives in an expansion unit later.

Cons: - HUGE CON: This model is locked exclusively to using Synology brand hard drives. Their standard drives are about 25% more money than an enterprise grade NAS HDD from other reputable brands like Seagate. Had to return my Seagate NAS drives to exchange with Synology. Really hate that Synology has gone this route.

Overall Review: Synology has been awesome for me over the last 5 years. I used them mainly for backups of our windows servers and for a few shared folders. Much easier navigation than windows servers. Easy to add and manage users. Using these for backups of other Synology devices or windows servers and computers is very easy. The biggest issue I have with this model specifically is that it does not except any other drive except for those that are Synology brand. It MUST be on their approved drives list, which conveniently only has Synology brand drives. This cost me an additional $600 compared to using enterprise grade NAS drives of the same size. This is not mentioned in this listing so beware of this. This is a new thing from Synology this year it seams. You cannot even install DSM without their drives. There is no workaround from what I could find.