Buspar is very safe. The only documented abuse, as far as I know, is snorting the stuff for highs in prison.
Compared to Benzo's! Benzo's are such a high risk factor the UN added them to their Convention on Psychotropic Substances (1971) to force worldwide control of them! They are risky in the long term as people have found to their cost and are now considered a short term anxiety strategy or for acute occasions.
Buspar is licenced in different ways though. In the UK it is licenced for short term anxiety treatment. It's different in the US.