Some time ago, I posted a thread on cycling shoes, lamenting the lack of totally waterproof shoes out there. Several good suggestions were offered, and I'm going to get a pair of winter boots made by 45North (the Wolvhammer, with the extra knee-high gaiters).
For now, I'm enjoying my Shimano mountain biking sandals, and wondering why I didn't do this years ago. I used to have the attitude that I'm not a professional athlete, and I don't need to shave two minutes off my commute to work. But now that I've had clipless pedals for just over a month, there's no going back. I'm even starting to get into cycling as a sport, instead of just a way to get around.
These sandals are perfect for summer, and those Wolvhammer boots will do nicely in winter. I may buy the Fasterkatt, but I dunno. That's two $400 pairs of boots. Maybe I'll settle for cheap shoes and a cleat-compatible cover for the fall.
The bike shop guy was right though. Clipless pedals did change my life.