i haven't seen any more failures from the 3400 or 3800 that i haven't seen from the 3700's. the remark was a small bit of humor.
i have worked on these for quite a while and know the 3400 will pull alot of hours before any major wear will show up, the chrome holds up just fine if you can keep the dust from passing the crappy excuse for a filter they put on these saws. the crank bearings are what you need to really look at, they would get sloppy on the second tank of fuel (exaduration of course) and then let the crank slap from side to side when they move outward. no stops in the bearing bores to stop them from walking right out and pushing the seals out to touch the flywheel or spit the other out on the clutch side.
unless your a builder the chromed piston/alloy cyl. won't cause any more problems that a chrome cyl,/alloy piston would.