to the hanifis this hadith proves sufficient and it is graded as Hasan...to the salafis they regard it as weak. because of a certain narrator known as 'Abdur-Rahman al Kufi'. to ascertain why he is weak they quote Imam Nawai saying "Abdur Rahman is unanimously [Consensus] weak". but this statement made by the Imam is in itself is weak because not every Scholar of Jarh and Ta'deel agrees with him... those who regarded him as a Thiqah Wa Sudooq, were Imam Tirmidhi, Imam Ibn Khuzaimah, Imam Hakim, Imam Bazzar, Imam Ijli, Allamah Suyooti and others. and also Imam Ibn Qayyim, Imam Diyaud-Din al Maqdisi [but these 2 Scholars i have to check to be sure]. hence these are all the appraisals Abdur Rahman al Kufi was not labelled a liar in his life, it was because of his memory, but the Scholars that were leniant on him state his words are not equivalent to a Hafidh but Hadiths may be recorded from him...hence his appraisals.