Topology change with dense low power nodes could potentially provide substantial capacity and coverage improvements to macro-cellular networks.  While relays have been well studied in the context of peer-to-peer and mesh networks, the design of relays in heterogeneous networks with large power disparity between the source and relay nodes has rarely been investigated. In this paper, we provide qualitative and numerical evaluation of RF repeater, FDD relay, TDD relay and relevant interference coordination techniques. It is shown that relays with WiFI access point form factor could be an effective solution for capacity and edge rate improvements in macro cellular networks.