Summary: Purchased two of these machines for our business that runs an 1841 on lease, as we are switching providers and must return it. Delivery was on time, which is a plus, except the units came with rack mountable ears that don't actually fit the model (Our seller, RetroHardware Inc, gave us first generation 1841s which cannot be rack mounted without a tray).
Summary: This is an excellent low cost router for setting up your CCNA lab. I prefer to work on real equipment even if it is a little older than the current equipment in modern enterprises. You get to use the actual Cisco commands via command line and see how the equipment responds and is great for troubleshooting. The modern lab at my school has 1841s and 2811 and this router was about $100, good price.
Summary: As a used router, these are a great choice right now. With two ethernet ports, two WIC slots and removable flash. They offer great functionality and features at a bargain price and are great items for those studying for Cisco certifications.
Summary: Does everything I need. Running 2 linux servers and a wap with about 5 constant devices across 4 subnets. I bought this to practice for the ccna and also run scenarios. The service contract is required to download any updates as ios 11 and lower do not have support for DHCP that most consumer isps support. It will run you about $150. I did max out the memory and upgraded the flash card, which for me both worked with "non cisco" media perfectly fine.
Summary: Cisco's 1841 router is very reliable. Configuring the router's interfaces with the CLI is like micro-managing. I'm a proud owner of 3 1841s for my home lab preparing for my CCNA certification and I am confident using the equipment.