I was looking to replace some old moonflower halogen bulb effects (EVL Spin 250) and these were more than I could've hoped for. Their light output, sharpness and wide dispersion angle easily allowed me to replace 4 old units with 2 of these. Lighter in construction, I still found them substantial and robust. I'm still trying the built in programmes but it seems that you can't select 1 sound to light option that cycles through all- there are around 24 programmes that have a couple of set colour/gobo combos that you need to choose; Although I quickly forgot about this during everything else in a performance. Maybe I haven't done enough research but my old units were controlled easily via a pre-programmed controller to give a dual-head lightshow, it's a shame that these appear to just copy each other and with the generic IR remote; fine for 2 units but I'd like that for 4. The biggest revelation for me in this upgrade (yes I know I've been stuck in the early 2000s with this!) is the USB wireless DMX interface on the Eurolite fixtures. For a cheap addon, it's the quickest and easiest way to setup.