Pro: Relieves trigger points (adhesion of tissue) and taut muscles.
Con: It's a needle
Pro: Faster treatment times
Con: Multiple needles can be utilised
Pro: Less massage for those that don't like being touched
Con: Less massage for those that like being touched
Pro: Evasive treatments
Con: Could cause bleeding or brusing.
If you experience pain and need quick & non evasive treatment do consider looking past the fact that they're needles and book in for MDN (Myofascial Dry Needling.)