I mean why would you ever buy one? AW were very cagey about giving any data either on range at their maximum cruise speed or speed at their best range, because at 275knts it does not have 700 miles of range.
The speed limit for UK OCAS is 250 kts, which means to take advantage of its upper cruise speed one must generally use airways. Also, its rotor loading is relatively high, not good for many private helicopter LSs for downwash reasons. Ergo, one would generally operate from an airfield. So there is little advantage in a vertical capability, especially as most biz jets are far quicker in any case.
My own view is that it's a compromise too far. But, speaking as someone qualified RW and FW, I'd fly it if someone foolishly wanted me to...