I am using as well PT10 and PT11 with Spark LE. V1.7 on a MacPro with RME fire face 800.
Globally it runs well.
At this moment I am getting issues with the 88.2 sample rate (does't work for me), so 96K is Ok, and the possibility to assign midi notes on pattern selection trough midi tracks is quite "amazing" : not found the possibility in the AAX plugin.
Sound is great, good dynamic, and very few crashes with PT11. Only when changing frequently instruments on a pad, for example.
I hope it will help.