CA Final DT Classes - BB sir is good?

I had recently purchased BB sir fastrack classes for Nov 20 exam. According to me unki classes achi hai kafi. Concept basis per bhi aur understanding basis per bhi. Wo examples dete hai kafi jisse smjhna asan ho jata hai chizo ko and question pratice bhi krwate hai so that ki smjh me aaye. But wo chizo ko mug up bhi krwate hai kafi and padhane time wo kafi sections ka reference bhi lete hai which he had not taught till that time(later cover kr dete hai). Last ke  few chapter me wo speed me padha dete hai simply compact book se like chapetrs of appeal, assessment, etc. But overall if you study you can score good marks by praticing question from his compiler. Mere kafi frnds ne exemption score kia hai. But main Nov 20 me first time DT ke paper dungi so i can't say. 

And about Satish mangal sir..i don't know. I hope it will be helpful for you in someways. 

Thanks