Yes I watched it. I already knew some of the history of of it, since the mutual antagonism of Harry H Corbett and Wilfred Brambell was quite well known at the time.
What I didn't realise previously was that Harry H Corbett was such a self obsessed character with a distinct streak of nastiness. Wilfred Brambell on the other hand, came across as a sad and lonely man who had difficulty coming to terms with his homosexuality at a time when it was illegal in the UK. Whether that was the case in reality is open to question, but that is certainly my impression of the way they were portrayed in this dramatisation.
I thought Phil Davis was brilliant as Wilfred Brambell, and at times his portrayal of Albert Steptoe was so like the original that I thought he could quite easily play the character in a new version of the series.
Jason Isaacs also gave an excellent performance as Harry. H Corbett, but had the distinct disadvantage of not being very much like him physically.
I also really enjoyed the performances of Burn Gorman (of Torchwood fame) and Rory Kinnear as Galton and Simpson. They just seemed to capture the characters of one of the UK's greatest comedy writing teams perfectly.
On the whole it was a fascinating and enlightening dramatisation of true events and I look forward to the next in the "Curse of...." series with great anticipation. If the others are half as good as this one, they will certainly be worth seeing.