We report recent success to stabilize the VLTI/MIDI-10um beam-combiner with K-band fringe tracking, provided
by PRIMA (FSU). After encouraging commissioning results, presented during the last SPIE, we accomplished
in November 2011 a successful run of science demonstration. A broad range of targets were observed, from
planet-hosting stars over YSO disks to AGN. We will present first results, focussing on the improvements on
sensitivity and precision with respect to classical MIDI stand-alone observations. MIDI broad-band dispersion
and group-delay can be reliably predicted by the fringe tracker to enable coherent integration beyond coherence
time at the lambda/10 precision level.
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