The images is safe but if you were to use the online update its possible it could download the so called time bomb drivers and these will brick your clone.
As above just dont do any online updates flash the image and use as it is.
Ferret,
Appreciate the advice pal. So as a clarification can I manually flash clone safe images including this clone safe image but NEVER attempt or CARRY out an online update of the image. Is that right pal?