Not quite sure what you mean by "safety". I live close by (7 years) and have not witnessed or heard of any anti-social behaviour. Have heard of the very rare break-in, but this can happen anywher these days.
Estates are well kept and most have resident associations that do good work on behalf of folk living in the area.
Like most large estates, some houses are rented out, but owners will be contacted promptly should anything unpleasant develop at the house.
In my opinion it is a good area of Newbridge.