I normally wear a 9.5, I went with the 43 boots (srs) and they fit fine with regular socks. I was addicted to wearing thick socks, mostly because other boots were so uncomfortable. The sidis are so comfortable, I just wear regular socks now. They are showing signs of wear just like other boots, Already on my second set of soles (only $17). They are somewhat splashproof, but not completely water proof. I pretty much gave up on finding "real" waterproof boots. Maybe I just got a leaky pair?
My review: they aren't perfect, but I highly recommend them due to comfort and protection! Thinking about getting another pair for motard.
By the way, don't buy the white ones, they look like crap right away and are hard to clean!