We saw it on Sunday and thoroughly enjoyed it. I had some reservations about Mrs Vernon, as I felt she was too welcoming and friendly when Lady Susan first arrives, as to my mind she should have been a good bit sharper and clearer of eye, just as she is in the novella. Sir James was wholly unlike I'd pictured him, but absolutely priceless, especially at the end when he reveals the situation. It was interesting to have Mrs Johnson played as an American, though I found her the weakest of the cast, perhaps because her somewhat understated acting style was so different from that of everyone else.
Being pernickity, there were some scenes which added little, and some characters who appear to have mostly ended on the cutting room floor making one wonder why they'd been included, and I'd have liked to have seen more of poor Miss Manwaring and her attempts on Sir James, especially when Austen tells us she is impoverished for two years after buying clothes to entrap him.
But the costumes were indeed fabulous, the interiors magnificent, and Kate Beckinsale superlative. I'd heartily recommend it.
I don't know if you saw, Teresa, but the director has also released a novel to accompany the film, written as if by a gentleman seeking to redress the horrid slurs cast against a charming and gracious young widow, scandalously maligned by, amongst others, a Spinster Authoress (a writer careless of both punctuation and truth): Love & Friendship: In Which Jane Austen’s Lady Susan Vernon Is Entirely Vindicated. It had a good review in our paper at the weekend, and looks to be quite entertaining.