I saw this production during its West End run last month. A few comments:
First off, I've never been a fan of the film version. I saw the original US production starring Tim Curry at the Roxy in LA, and was sorely disappointed when the film came out. Aside from capturing his performance for the ages, it was sooooo lacking in energy compared to the stage version.
The show did not have alternating Narrators when I saw it. (That was a one time deal for the broadcast.) Instead, Richard O'Brien did all the narrating -- and seeing him overseeing of his creation was pure magic!
The sets looked much better on the broadcast than they did live. I think there's an level of tackiness and cheese that is appropriate. Too often, these just looked dinner-theater cheap.
Although nothing can ever compare with seeing Tim Curry live, I thought Bedella did a terrific job of both honoring Curry's performance while adding enough to make it his own. He was particularly good in his ad-libs and responses to the audience (which is something Curry never had to deal with).
Speaking of the audience: I had a self-professed "shouter" sitting next to me. I thought that was going to piss me off but actually it turned out to be one of the best things about this performance. It wasn't overdone (much) and often added a really fun element to the show. (O'Brien and Bedella being particularly skilled at responding to the audience shouts.) Although you can hear some of it on the BBC broadcast, it seemed more muted than seeing it live.
Re: the scene with Frank & Brad in bed. Both Bedella and Ben Forster completely LOST IT! I've never seen actors break down so hysterically before. You can see some of this in the BBC recording, too, but it was much worse (or better?) when I saw it. Again, that would normally be a huge sin. What is it about Rocky Horror that makes us, not only forgive, but applaud such lapses?
Seeing this live, I thought Dominic Andersen as Rocky was terrific -- as well as being one of the most gorgeous men I've ever seen on stage. (Frank N. Furter really knocked it outta the park when he made this one.) I did not think his singing was flat at all. But then, his singing was not exactly my focus. :p
All in all, I am very happy to have this BBC America broadcast as a "souvenir" and am glad that others got a chance to see it, too. Good memories of good times!