My first impression having now tried the base and the accompanying basic curry is that it was, for me, a bit bland. There was flavour there from the aromatics but in general the base didn't taste all that different from many other bases I've made.
I realised reading the latter posts that I used exact teaspoon measures rather than "rounded" so it may have had a bit more oomph if I'd not missed that. But the curry reminded me of the vindaloo I made from Chef Din's base by his method where again there are no added spices in the curry. The base is the curry.
I think if korma is a "curry" you like then this base/curry combination will appeal but if you're a madras, vindaloo type of person like me, it's a bit meh. I'll try it again with added mix powder as I did with Chef Din's which made his palatable from originally being bland. And of course add more chilli powder. And for those that haven't made it yet, really go to town on the staggered reduction as that's mainly where the flavour is coming from.
Oh and against my best judgement I did use raw chicken rather than precooked. It produce the bland chicken flavour I know goes with essentially cooking it in base sauce and that didn't help the overall impression. But that was down to me not using precooked as I should have.