and you know this how?,
OP, for a grand you have many options with the protector just happening to be FOTM, before dropping that sort of cash I would do more research and try not to just fall into the hype that goes with the protector. no doubt its a great amp, but A, its actually not strictly balanced, as the signal is referenced to ground and then floated on output and B, the pico slim may actually be a better choice.
In terms of the what has been said on the forums so far, the protector has better synergy with the 13's than the slim. In terms of the 16's, this will most likely hold true (from my research).. but we wont know 100% until people get to experiment with both, and since the 16's just started shipping and the pico slims start this week we will have to wait and see