Cisco 550X Series Stackable Managed Switches include capabilities and management options needed to support applications today and in the future, such as security, advanced QoS, comprehensive IPv6 support, and Layer 3 dynamic routing.
It works very well as stack of core switches in small/medium company with 4x 10Gbit SFP+ interfaces. Native stacking is simple and in ring topology every switch has 2 redundant connections. They support maximum of 8 units per stack. You could use Cisco SG500X in hybrid stack with other series of switches, but make sure if other switch is compatible with hybrid mode stacking. Hybrid stack mode lower the number of units in stack. You should consider other model of switches if you need more then four SFP+ ports to connect more access switches using fiber cables.
Cisco is a name well known in the IT field. The technology is tried and true and they have built a reputation on a solid platform. Though many people do not like the cost of the devices and the continued fees associated with long term ownership, you get what you pay for. I dont hesitate to recommend Cisco because I know people will get a solid product that will last a long time.
Easy setup and configuration. While the web UI has its quirks, setting up VLANs and other tasks which can be exceedingly complicated on other switches, are much easier on Cisco SG switches. You also have the ability to upload an existing configuration to switches, which can speed up the task of deploying many identical switches.
Features for the price. Getting a 48 port L3 switch with PoE+ for less than $2,000 is a great value.
Reliability. We have hundreds of the SG switches in dozens of client sites, many in harsh conditions, and they just keep going.
The web UI has taken a turn for the worse with the latest firmware on the SGx50 models -- the bifurcation between basic and advanced modes and the changes to the way VLANs are modified is a step backward in my opinion.
The power bricks on smaller models are enormous. I'm sure, however, keeping this circuitry external to the switch is what keeps my switches running year after year in hot environments.
Fans can be a bit loud on larger switches -- this is true of pretty much any 1U device though.
Cisco 550X switches stack using 10Gbit SFP+ ports on the front, while Dell N Series has dedicated ports (with cables) on the back of the unit. On the other hand dell N switches has number on small digital display showing stack member number, which is easier to identify. The cisco switches has dot beside the number of the switch member. I think Cisco devices are more reliable and stable than dell switches.
Cisco is more enterprise level, more reliable, and generally more feature rich but also very expensive. That being said old or refurbished Cisco switches are much more affordable and in comparison to even new switches from the competitor they are still a great value even though they are used. I like Ubiquiti switches as well but Cisco is usually better overall.