response time is very important ONLY if you are watching like HD movies, kung regular tv feed lang, you will not notice the the difference of 2,5 or 8 ms BUT if you are watching a 1080p movie via say bluray player (or the other HD movie players), then may mapapansin kang konteng difference, mas maganda tingnan pag sa 2ms. but then again, you will only notice this pag nakita mo na sa dalawang screen, one 2ms the other say 8ms.
in this case kung tama yung nakalagay na 2.4ms, then this is very good
honestly, pag ako, hindi ko na pinapansin ang refresh rate, im more after sa response time. since as far i know, lahat yan 60hz naman ang refresh rate, may some kind of correction lang na ginagawa yung iba kaya sabi nila mga 120 or 240hz ang refresh rate