Hi folks, I'm a relatively new pilot, just finally signed up to the forum properly.
Prop guards - I've been using them since getting my standard just after Christmas. The only drawback I've found is that they can come into view on camera when you're pitching forward. I usually tilt the camera down slightly to avoid this. A positive incident was one time when landing manually, I accidentally pushed the right stick, before the engines shut down. This made the drone try to fly backwards when it was touching the floor. So it fell over backwards and bounced up and down on the prop guards till I got the engines shut off. If I hadn't had them, my rear props would have been toast.
So, pros and cons I guess, but I'm keeping them for now.