Last 1,5 years I've been skating on Ellipse XS which was a great imrovement (even for an amateur player) over a single profile radius that I've been skating on my whole life. I could skate on it immediately with practially no time needed to adopt and it felt very natural. The most importantly, it immediately solved my ballance issues going from 263 mm to 246 mm blades. I was more than happy.
However, recently I've tried Quad XS and must say I like ti very much for it's agility. Changing directions, quick turns, quick starts is much easirer than with the Ellipse. Maybe going straight line to reach and maintain top speed is better with the Ellipse but I think my favourite profile now is Quad XS on 246 steel. To balance out the top speed and gliding, I may consider dropping down ROH from 3/4" to 7/8". Let's see how it goes after couple more games.