I finished this yesterday but wanted to reflect on it for 24 hours before posting. The forum seems quite polarised this week but I think that I'm somewhere in the middle. For me it was a puzzle of two halves.
I found all of the cold-solving to be a bit of a slog and had cracked somewhere between half and three quarters of the clues before I could make any headway with the grid entries. The double-letter cells made it quite complicated to fit together and I ended up using trial and error to slot a few words into various parts of the grid until I found an arrangement that started to look sensible.
After I'd got over that hurdle it was the most fun I've had in ages. The clues fit together neatly, the messages appeared and the endgame was very neat. Thoroughly enjoyable and a phenomenally clever construction by Twin, who is one of my favourite setters.
So as I say, I'm in two minds about this one. It was an absolute joy of a puzzle slightly let down by just a touch too much cold solving at the start.