CML buffer advantages for VCO

Hello,
I would like to ask which are the advantages about using cml as vco buffers.

Thanks in advance!

CML = current-mode logic?

Constant-current operation makes less ground noise on
switching edges, whose ringing can make random or
cyclostationary phase noise.

If trace impedances are low and traces short, CML can
be one of the fastest logic interfaces. However CML is
not exactly standardized, meaning you have to own
both ends (or get lucky). On-chip, probably a winner.

PECL and LVDS are not bad alternatives (better than
bang-bang CMOS anyhow).