There are two variants of the Electric Buffer' large and small.
That's basically my variant of a RP-Relay/BC-Hopper. It just needs 1 EU per transferred Item (2EU for the large edition), and transfers Items directly into its attached Inventory (red facing). There are 2 variants, the basic small one, with just space for one stack, and the large one with 27 slots like a chest.
Note: The electric Buffer can be used as some kind of more realistic unidirectional Pipe/Tube, where item stacks are moving at a relative random speed (at least 1 Meter per second).
Like Translocators, Buffers also output 32EU/t to their Outputsides (they have no special Inputfacing) and its also configurable in the GUI. That way you can connect the EU-line to the buffer instead of the machine, or make a chain of buffers to form some kind of item/EU-pipeline, without having to lay additional cables around it.
Buffers also have several redstone behaviours that can be specified in their GUI. If the Buffer has no empty slot, then it emits a redstone signal (takes up to Slotcount*1 EU/sec for searching after an empty slot), or if you press the Invert-button, then it will stop emitting a redstone signal. This is useful when you use the Massfabricator instead of the Matterfabricator.
The Advanced Electric Buffer is able to put its one item stack into a specified slot of the connected machine, if that slot is somehow reachable. Ideal for refueling Nuclear Reactors.
Large Electric Buffer
Large Electric Buffer (GregTech)
Small Electric Buffer