Hate it. Usually get caught out 1-2 times per year.
Last week a fast-moving squall came out of nowhere when I was 15 miles away from home. I hunkered down under a railway bridge while the worst passed, but it was getting dark, so I had to ride in the rain. Road were wet and I got soaked. Mostly, I hate having to deep clean the bike. There was still a lot of grit on the roads from winter and much of it ended up on the bike. I worry about slick spots as well. Lots of manhole covers, painted lines, grates, and rail tracks to negotiate. Really have to slow it down when it's wet.