  A recent surge of interest in the {\em early} unification of quarks and
leptons, has prompted us to revive a paper \cite{HBB} written twenty two years
ago. We provided there a general discussion of quark-lepton unification
characterized by the gauge group $G_{S} \otimes G_{W}$ with two couplings $g_S$
and $g_W$ and by the unification mass scales $10\tev-1000\tev$. The constraint
from $\sin^2 \theta_{W}$ restricts the choices for $G_W$ and our favorite model
was chosen to be $SU(4)_{\rm PS}\otimes SU(2)^4$. We review the main results of
\cite{HBB}, update the original $SU(4)_{\rm PS}\otimes SU(2)^4$ model and
propose two new models based on the groups $SU(4)_{\rm PS}\otimes SU(2)^3$ and
$SU(4)_{\rm PS}\otimes SU(3)^2$ for which the consistency with the measured
value of $\sin^{2}\theta_{W}(M_{Z}^{2})$ determines the unification scale to be
roughly $1 {\rm TeV}$ and $3-10 {\rm TeV}$, respectively. The implications of
this very early unification is the existence of new quarks and leptons with
charges up to 4/3 (for quarks) and 2 (for leptons) and masses $\ord(250\gev)$.
Interestingly, in these models the rare decay $K_L\to \mu e$ is automatically
absent at tree level and the one-loop contributions are consistent with the
experimental upper bound for this decay.
