  Budker INP hosts two e+e- colliders, VEPP-4M operating in the beam energy
range of 1-5.5 GeV and the low-energy machine VEPP-2000, collecting data at
160-1000 MeV per beam. The latter uses a novel concept of round colliding
beams. The paper presents an overview of observed beam-beam effects and
obtained luminosities.
