so far no man, but there was once when i wished i had it, which was the main reason why i got it.
there was once i was playing a pretty important gig. long story short, shit happens (as early as the previous gig about 2 weeks before) and i wanted to bring insurance. i was using one of those flimsy old skool trolleys, and although the journey was merely from my drummer's car to the stage, it was like 50 metres of hell.
risked damaging my equipment (which was at the time relatively new). and that's why i eventually bought the trolley. but so far no action
but the multicart itself is freaking heavy