I have been training in the boston boost and do all my mileage and tempos in them. Best shoes I've ever had. The durability is incredible too. Sometimes though I find myself wanting a nice soft cushy shoe for when my feet are feeling beat up, particularly the day after workouts in flats. So I'm looking for an adidas shoe with a similar fit to the bostons (fairly narrow), but with a softer ride for those easy mileage days.
The Supernova looks good but i've read that the fit is much different. Maybe the ultra boost? Other suggestions?