  Recently, a high energy superconducting (SC) \epem linear collider (LC) with
energy recovery (ERLC) have been proposed where twin RF structures are used to
avoid parasitic collisions within linacs. Such a collider can operate in a duty
cycle (DC) or in a continuous (CW) modes (if sufficient power) with a
luminosity of ${\cal O}(10^{36})$ \cms at $2E_0=250-500$ GeV. In this paper, I
note that the luminosity at the ERLC operating in duty cycle mode does not
depend on the accelerating gradient (at the same total power), but only
slightly changes as $L \propto \sqrt{Q}$. So, the ERLC can work at maximum
available acceleration gradients. The article also considers $e^-e^-$ twin
collider with energy recovery and estimates the achievable luminosity. Such an
$e^-e^-$ collider is much simpler than $e^+e^-$ one, because beam recirculation
is not required, can have $L$ well above $10^{36}$ cm$^{-2}$s$^{-1}$. It also
has a fairly rich physics program.
