The reviews of this movie really put me off so I want to point out a few things. First off, this does not seem to be a complete remake of Special 26. The director and writers seem to have taken creative decisions to alter the source material to suit Tamil audiences. Next is the fact that the original movie Special 26 is a movie based off actual events that occurred in North India. It would really make no sense to recreate the same movie when in the original they try to portray a semi historical account of the heists that occurred. Instead they've taken a different approach and altered the plot and the characters as well. I also loved the twist that happens in the end from the original (Special 26) however they've changed the twist in this movie but it was still pretty good. Definitely try to watch Special 26, it is a great movie but still give "Thaanaa Serndha Koottam" a watch.
Watch it if you like Surya, watch it if you want to laugh and have fun.