A solid connection can be slightly positional but work well otherwise.
These do the job well but can be very slightly finicky in how well they connect depending upon positioning.  What I mean is that on a rare occassion, no electricity transmits through them to the electrode pad.  To resolve this, I simply press lightly on the snap connector.  Doing so has always been enough to reestablish the connection.  The problem might not be specifically with this product though.  It could be with snap style connectors in general since I have no issues with the full wire style connectors.  I bought these adapters so I could use both snap and wire style electrodes with my TENS/EMS unit.
Rating: 4 stars