Having a black box does make you drive more safely which is a positive. Be warned however if you excessively speed you will receive warnings and potentially your policy may be cancelled. In my first week I pushed it slightly and received threatening emails which was unpleasant but fair enough as I was speeding, Wouldn't advise getting a black box if you can not deal with driving the speed limit as it will frustrate you more than paying more for your policy initially. Despite having warnings initially I managed to improve my score over the rest of the quarter and received £30 back which was a nice surprise. You can also drive at approx 10% over + a few mph the speed limit and the box doesn't seem to pick it up so it's not too bad, you adjust to having the black box and it's not an issue for me now. Looking back though I'd rather spend a couple hundred more and not get a black box than save £30 a quid every three months from having one as there are times where it's very tedious having a black box. All in all have only been with carrott three months and it's my first ever experience with a car insurance comapny so can't give a very insightful review but I'm overall pleased no problems.