I had no idea this had started this past Sunday until this evening so that was a nice surprise. It was originally slated to air over Christmas last year like "And Then There Were None" and "Witness for the Prosecution" but was postponed after the Ed Westwick accusations (his scenes have been reshot with Christian Cooke), I was expecting it to be delayed until summer or autumn.
Anyway I enjoyed the opening episode. I've seen the Miss Marple version with Geraldine McEwan years ago so assuming they keep the killer the same I already know who did it but the same went for ATTWN and that didn't dampen my enjoyment of it.