yes, shutter lag will send you crazy
I bought a decent camera after missing a great shot!
I was out with RichL just in the channel and a dolphin surfaced to check us out right next to the Rib.
I pressed the shuuter on mine and Rich had his cell phone camera and we both missed him
So, yes have a decent camera,plus try to anticipate them breaking the surface, as they dont really clear the water.
Will try again next week, as they have cute eyes and really want a clear shot