Been experimenting with Vyatta lately. So far the results have been good overall. There are a lot of issues that I have faced with Vyatta, but the potential for it becoming a powerful contender in the enterprise routing space are promising.

Pros:

• Powerful features – Everything from BGP to active/active HA
• Debian user-land – Familiar command interface speeds up routine tasks and makes the initial investment of time to learn the platform minimal.
• Rich CLI – For working with vyatta specific routing services, there is a rich and easy to use CLI that you can manipulate just about anything on the system with. Tab completion makes it easy to figure out the nomenclature.

Cons

• Stability - issues with stability of the platform. Hardware compatibility may be a factor here, but the beauty of Vytta is it’s Debian base that should allow it to be installed on a variety of hardware. If you really want to go pro with Vyatta, their appliance versions have certified hardware so you don’t have any unknowns in that area.
• Dependence on consulting – Some advanced features are really hard to get to work right unless you are a Vyatta expert, so you can end up being dependent on professional services from commercial entity behind the software. It’s a fair trade-off as you are paying pennies on the dollar compared to Cisco/Juniper solution.