The FSP CST350 Plus certainly delivers on its core premise of being a very compact M-ATX chassis. Very similar in size to other enclosures like the Cooler Master NR200, it manages to eek out a bit more room to hold the larger motherboards. On top of that, it is competitively priced at $90 as well, making it a potential alternative even for those looking to build ITX systems.

Having several elements in common with other cases out there, it provides plenty of versatility between the ability to hold an ATX PSU in the forward position or the flexibility to have an SFX unit at four different placements, with good cable management options. In terms of storage, FSP also manages to give you lots of possibilities on all three mounting brackets for fans or liquid cooling, as well as on the PSU cage or front of the chassis.

That said, as with most SFF cases, you will have to plan your ITX build rather carefully to make sure everything fits within the chassis. For example a short SFX PSU is at the center of such a build to retain the useful flexibility of ceiling cooling and long GPUs.

That meticulous planning element is even more important with M-ATX setups. While FSP does advertise a very optimistic ability to put such a board inside the CST350 Plus and retain the side mounting location for an SFX PSU - which in essence means you get all the benefits of an ITX case but for an M-ATX board - that really doesn't really translate into reality when all noteworthy options of that form-factor on the market are wider. All that compromise means less flexibility in storage, air or liquid cooling, and FSP doesn't make it any easier by forcing users to install 2.5" drives on the interior in the front of the chassis, for example.

With all that in mind, it leaves the FSP CST350 Plus in an somewhat awkward position between being extremely compact for an M-ATX case but also restricting the user quite a bit to achieve that sizing. However, based on its adequately low price point, it manages to clock in lower than other, similar ITX cases, while offering that additional possibility of M-ATX does broaden its general appeal and as such, the FSP CST350 Plus can be recommended if you are willing to invest in the planning and purchasing of the right components to make the SFF chassis work for you.