I'd quite like an open clutch cover, but IMHO they only look any good with a billet pressure plate, stainless steel springs and anodised spring caps to show off underneath it, so you're getting into quite a bit of wedge.
Whenever I've had that sort of money, there's always been something that I've needed a bit more, like new tyres or something.
My ST has it's standard clutch cover, but I'm thinking about doing the same trick on it as my 888, which came with a closed carbon fibre clutch cover that has a couple of washers between each mounting point and the clutch housing, thus creating a gap to let the dust out
When things run cooler they also perform better, hot plates expand ever so slightly. Run an open cover and you will notice a slight smoother increase in performance.
Wet clutches lose the bike Bhp as there is drag in the oil, I suspect hot expanded plates may create the same drag.
If doing track days swop it over for the original. More likely to have an off. A relativly minor spill can cost heaps if the bike goes dode on the clutct. No one worried about bling on your bike at trackdays.