Not taken offensively at all and thanks for taking the time to reply. I've had good experience with my 560XPG and while I'd heard of a few problems with early carbs and a service bulletin which recommended sealant be used to help set the gasket on 560/562's which had the cylinder removed/replaced, I wanted to know more. It's not something I'll worry about to be honest as there are literally so many of them out there at this stage, a failure here and there will happen. Doesn't matter the brand or model.
Interesting to hear about your logger friend having two failures in a very short timeframe. I think it's reasonable to say that this isn't the norm and something unusual has happened there.
Anyway, nice to hear input from a Stihl guy who's happy to run his preferred brand without wanting to have a row with the Husky guys!
I like Stihl products, but personal preference pushes me into Husky ownership where all else is pretty equal.