Bollywood megastar Amitabh Bachchan is quite impressed with his daughter-in-law Aishwarya Rai's looks in "Robot" and describes her on-screen presence as "smashing".

Director Shankar's bilingual film - "Robot" in Hindi and "Endhiran" in Tamil, which has Rajnikanth in the male lead, opened to rave reviews.

"Aishwarya looked smashing and danced like she had never danced before. Rajni...what can one say for this man. He is just unbelievable. The film is a roller-coaster ride of fun and ecstasy and events of mammoth proportions, " Amitabh posted on his blog.

He saw the movie Monday at a special screening organised by Rajnikanth in Mumbai for the Hindi film fraternity.

"There was a large turn out from the industry - directors, producers, artists and all were simply blown to pieces by the product and its presentation. When you go to see a Rajni film, it's not the film that you wish to see. You see the film for the experience of it. And in this one, the experience is incredible, " he added.

The sci-fi thriller, apparently made at a whopping budget of Rs.175 crore ($38 million), boasts of a lot of special effects and Amitabh is in awe of it.

"Merely putting his thoughts on paper must have been an exercise so desirable for the director Shankar. What and how did he think up all these ideas for the script from his mind is reason to envy and lament.

"Aamir (Khan), after the show was over, wanted to 'eat his brain' - Shankar's that is - to find out how he managed to conquer that world that he so effectively portrayed on screen."

The 67-year-old, who will be back on the small screen with "Kaun Banega Crorepati 2010" starting Oct 11, highly recommends "Robot".

"An incredible experience it was and I sincerely urge all those that reside in the world of Chennai to go see it first day first show. Rajni was incredible, Aishwarya was colourful and danced like a dream and content and delivery was simply extraordinary, " he added.