In my opinion, there are both good reasons for, and against monoblock amplifiers. Single chassis stereo has advantages, just as dual chassis mono has considerable advantages.
There is no doubt however, if I was looking for a pair of Purifi mono implementations, these are the ones to buy. Your amplifiers will last you for decades, many decades, and coughing up for quality means you can focus on other things in life and just rest easy in the knowledge you decided to "buy once and buy well".
As it was said: 'The Bitterness of poor quality remains long after the sweetness of low price is forgotten’
Well done Fred.