Well my opinion is this: Bitconnect is high risk and fairley likely it's a Ponzi of some kind. It is possible it is NOT a ponzi also. My advice is to invest some spare BTC in there and then not re-invest until you get back your ROI. Then do whatever you like as it's free money from that point.
I've been in it for a month or so and have made some vids/guides about it.