i totally agree with you my friend, but my concern is Demat Account safe with them, because i m thinking of using my shares as co-lateral for positional trading.
Yes your demat account is totally safe, even I use my holdings as co-lateral for intraday with them.
You can simply transfer your shares to CCA (client collateral account) and can get Margin against your holdings; the CCA account belongs to you only, so no worries.
Rest they are also registered with SEBI, NSE, BSE, CDSL, MCX & NCDEX.