We, too, always booked our own business class air with miles. As you all know mileage flights have gotten more expensive (thinking Delta skypesos in particular) and good routes harder to find. Easy to find multiple stops with multiple classes or 40 minute connections which we do not want.
SS gave us such an amazing deal from Heathrow to Tucson in business class that I asked my TA to get it in writing as it seemed too good to be true.
London to Denver - Delta One
Denver to Tucson - Delta First
$599 per person
Doesn't get better than that.
My advice: check it out -- might be a good option.