I made this tonight, substituting the Discovery Chipotle paste for the canned chipotles listed in the recipe.
Verdict...? Highly delicious and deceptively simple to cook. Deceptive because at first glance with such a long cooking time it seems like it might be lots of hassle, but actually after making the spice rub with just a few ingredients and coating the pork you just put it in the slow cooker and forget it. No stirring. No turning. No peeking until 8hrs later. And then it's just shred and add passata and chipotle and back for a 30 min stew. Very easy!
The one change I would make next time is to halve or maybe reduce by a third the chilli powder content. I just found the chilli heat overpowered the other flavours at the end and having waited 8 hours for the meaty delicious flavours to concentrate together I wanted them and the chipotle smokiness to come through more strongly rather than being "stomped on" a bit by the power of chilli powder. There was a bit of acidity present from the passata too, maybe I will add more sugar at the start to balance it.
But these are details. Overall it was a rock solid recipe and technique and with pork shoulder at