No idea -- I learn a lot from them
From 2000 until 2014
Learning at the beginning
Nope -- If well planed you should be alright
Not reliable for long term -- seem inferior quality
Depends on the product and the knowledge. Cisco firewalls can be difficult at first but once learned it's fine.
Me, I implemented the firewalls, Cisco switches and routers.
100% in some installations it exceeded the time predicted to keep up with the work load.
Netscreen, Netgear, Checkpoint, others..
Plan well the hardware requirements for future growth and heavy usage.