Mudguards, I hate them with a passion and will only fit them when the weather goes beyond wet into the cold and wet and phase. So last weekend, I fitted them and today was the first ride. Yes, a dry arse, but they rattle and scrape and are horrid. So tonight, the front guard has come off - will leave the back on one - for the time being.
As for protecting following riders. That is bollox, they do not do this, they simply reduce the spray. Having spent many an hour on someone's wheel with race blades, guards and nothing, the only type that actually works is the one's with a persil bottle attached to the bottom - but that is so uncool as to be unacceptable. Imagine rapha/assos and a persil bottle - it does not bear thinking about.