The company I work for uses Boral almost 100% of the time for all exterior trim. I personally don't care for it.
It has less durability than wood for abrasions. It is almost impossible to handle a 16' piece without a second person. The dust is incredibly hard on tools. It cannot be mitered and joined to another for a sharp outside corner unless that corner is assembled in a vacuum away from any intereference from any person or object.
Having said the above, I would use it for applications that are 5' above grade or higher, but I would only cut it with tools I don't care about or cheap tools bought expressly for Boral use. If sliding saws or table saws are used, you can expect the slides to get gritty and table saw trunnions to seize no matter how much compressed air you blow on dust coated parts.
Even though I don't care for the product, there doesn't seem to be a cost effective alternative, so I will have to suck it up and continue working with it.
This thread reminds me that it's time to hit my boss up for another disposable miter saw and table saw!