The 019 has the same reliability reputation in these parts as a defensive french force. Looks the part but boy is that sucker bound to let you down and need help.
A good mate brought 2 when he was starting out a year back, after less than 6 months he has brought echos to replace them.
I have an 020 and a CS3400 and have used the 335xp at times, but not that often to comment.
Bang for buck, get the cs3400, its not quite as good at the 020 in alot of ways but represents the greatest value for money, the shape is better for not getting snagged as much and its lighter than the 020.
020 is a great legend of a saw, but for the money you pay it ought to be that and more. Still I wouldnt part with mine, I carry a 12 and 15 inch bar with mine, means with the bigger stuff you can do alot more before having to grab a rearhandled saw.