  Over the last 5 years, UVIT has completed observations of more than 500
proposals with ~ 800 unique pointings. In addition, regular planned monitoring
observations have been made and from their analysis various key parameters
related to in orbit performance of UVIT have been quantified. The sensitivities
of the UV channels have remained steady indicating no effect of potential
molecular contamination confirming the adequacy of all the protocols
implemented for avoiding contamination. The quality of the PSF through the
years confirms adequacy of thermal control measures. The early calibrations
obtained during the Performance Verification (PV) phase have been further
revised for more subtle effects. These include flat fields and detector
distortions with greater precision. The operations of UVIT have also evolved
through in orbit experience, e.g. tweaking of operational sequencing, protocol
for recovery from bright object detection (BOD) shutdowns, parameters for BOD
thresholds, etc. Finally, some effects of charged particle hits on electronics
led to opimised strategy for regular resetting. The Near-UV channel was lost in
one of such operations. All the above in-orbit experiences are presented here.
