With Crooked eager to do BGs, it's been my fastest climb between Prestige levels. Blizzard says they're not adding more Prestige levels, which means I might be able to get to the end, and maybe Crooked can reach the end also.
There wasn't anything special with the 19 reward - I think it was AP - but it's better than the reward at 20... which are Marks of Honour! LOL
Well, there would be people complaining about grinding out the end prestige rewards, so I suppose the easier reward is nothing of interest.