The Enhancer if I read the description right is just beneficial bacteria that 'enhance' your cycle. If your tank is already cycled my opinion is it's worthless. If you haven't started it yet it's likely similiar to any bacteria starter product. It does have a picture of a discuss on the front, but I doubt it's one of those slime coat builders...and if it is it's worthless for marine anyways. Just another product that preys off the paranoia that your biological bacteria are delicate and need 'enhancing' when the truth is if your tank is cycled you can't host more bacteria than you have anyways. It's limited via bioload.
'Buffers' are perhaps the biggest snake oil in the industry. Note how it claims it's 'not bicarbonate' but then lists the stuff it claims it's not in the ingredient list. pH is not something you manage with a plastic bottle of anything and fish don't really care provided you do periodic water changes.