Fast, expandable Synology NAS with a premium price and mixed value

Is the SYNOLOGY 4-Bay DS925+ NAS with Expandable Capacity worth buying? Yes, if you want a 4-bay Synology NAS with strong networking, expansion support, and you’re happy paying £625.16; no, if you want the cheapest path to basic home storage. The current price is also the all-time lowest, which makes this a more defensible purchase than usual for a Synology box.

First impressions

The DS925+ sits in Synology’s more capable home and small-office tier: a 4-bay desktop NAS with dual 2.5GbE ports, support for up to 522/565MB/s sequential read/write throughput, and the option to add a DX525 expansion unit for 5 additional drive bays and up to 180TB of storage. That combination makes it easy to see the appeal for Plex libraries, shared backups, photo storage, and light virtualisation or surveillance workloads.

The headline attraction is not raw hardware alone, though. Synology’s software ecosystem is part of the pitch here, with integrated file and photo management, data protection, virtualization, and surveillance solutions. For many buyers, that matters as much as the CPU or network ports, because the NAS is meant to be the always-on centre of the home lab rather than just a disk enclosure.

How does the DS925+ perform in practice?

Synology quotes up to 522MB/s read and 565MB/s write sequential throughput, which is more than enough to saturate a single 1GbE network and makes the dual 2.5GbE ports genuinely relevant. In practical terms, that means faster file copies, smoother multi-user access, and better headroom if you’re backing up several PCs or streaming media while other tasks are running.

The dual ports also add a redundancy angle. If you only have one switch port available, or you want a more resilient network setup, having two 2.5GbE interfaces is useful. That said, this is still a NAS that depends heavily on the rest of your network and drives; the quoted throughput is a ceiling, not a guarantee.

Is the storage expansion useful?

Yes, especially for buyers who expect their storage needs to grow. The DS925+ can be paired with one DX525 expansion drive to add 5 more bays, taking you from a 4-bay unit to a much larger storage platform with up to 180TB capacity. For media hoarders, camera footage, or long-term backup retention, that is a meaningful upgrade path.

The catch is that expansion is an extra-cost route, so the system’s real-world price can climb quickly once you add drives and the expansion chassis. If you only need a small NAS for a few SSDs or a couple of hard drives, the DS925+ may be more machine than you need.

Build quality and feature set

Synology’s hardware reputation is a major reason people buy these units, and the DS925+ continues that pattern with a 3-year limited hardware warranty, extendable to 5 years in select markets. That warranty support is reassuring at this price point, particularly for a NAS that may run continuously for years.

The feature set is also broad: file sharing, photo management, data protection, virtualization, and surveillance are all part of the package. That makes it a practical choice for users who want one box to do several jobs instead of stitching together separate services.

Is it good value for money?

At £625.16, the DS925+ is not cheap. Its value comes from capability and expandability rather than bargain pricing. Compared with the Synology DS223J 2-Bay Desktop NAS at £179.97 and 4.4★, the DS925+ is a much more serious machine, but it costs over three times as much. Against the Synology DS224+ 2-Bay NAS Desktop at £506.05 with 4.5★, the DS925+ asks for a premium of £119.11 for two extra bays, dual 2.5GbE, and expansion support.

The comparison gets even tighter with the Synology 2-Bay DS224+ (Black) at £538.79 and 4.6★. That means the DS925+ is only £86.37 more expensive than a highly rated 2-bay alternative, which makes the extra two bays and expansion path easier to justify if you genuinely need them.

What should buyers watch out for?

The main warning is simple: this is a premium NAS, and the value only works if you will actually use the extra bays, the 2.5GbE networking, or the expansion option. If you just need a basic backup target, cheaper two-bay Synology models offer better entry pricing and stronger review scores. The other caution is that the review score is 3.9/5 from 82 reviews, which is respectable but not outstanding for a Synology device; that suggests some buyers expected more for the money.

Bottom line

The DS925+ is best for users who want a capable, expandable Synology platform and are willing to pay £625.16 for it, especially while it sits at its all-time lowest price. If you value Synology’s software, need 4 bays now, and may want 5 more bays later, this is a compelling option. If you only need straightforward home NAS storage, the cheaper DS224+ range is the better-value route.