Adtran NetVanta series switches are a very desirable switch set at a reasonable price point with a large amount of configuration ability for both L2 and L3. They are best suited for medium to large institutions that are not Cisco Dependent. They work well for small businesses as well but may be too high of a price point and too large of a feature set needed for a SOHO type set up which may turn away customers in that range. The 1531/P series does offer a smaller switch with the option of PoE in the P model and gives a total of 12 individual ports between the 8 PoE ports, 2 non PoE ports, and 2 SFP ports capable of Gigabit or 2.5Gbps with Adtran's interconnect cable. This may be more suitable for a SOHO set up but again may offer more than many small businesses need and may seem daunting.
Core and data center applications are the strengths of Arista products. The distribution layer is also a good fit. For the access layer, it would be more of a niche product.
I have used the Catalyst 6500 series in the past. From my point of view, the Arista surpasses the Catalyst on just about every front. Originally we were planning on implementing the Nexus 7000/7700 series switches for our core. Though a little more feature rich, it did not provide features we needed that the Arista did. The Nexus also was a confusing and complex platform to work with. Also, the Nexus was a significantly more expensive solution. Although very happy with the Arista switches we may evaluate the Aruba HPE 8400 chassis-based switches along with Arista switches in the future.
High Performance and reliability have allowed for a 'set it and forget it' type installation, giving greater customer satisfaction.
The price point of the switches, while higher than other models such as HP or Dell potentially, is in line with their reliability and functionality and comes in less than Cisco much of the time.
Having a long time relationship with Adtran as a company has allowed us to quickly assist customers with their needs, saving everyone time and money.
