I'd only suggest these cloclocks if you planned to time indoors. You can't see the numbers outside. The price is that for a reason.
The clock is certainly rain proof, but I wouldn't call it waterproof, it has vents in the bottom so just be careful about leaving it down in a puddle or turned to the side in rain etc ha.
In terms of the display, it's decent and bright and fine for outdoors, also if your battery is dying the display goes dim, rather than suddenly turning off, so you get some warning ha! The only slight annoyance is the viewing angles wouldn't be fantastic, but the main thing is its good and bright when your looking at it head on, which is where most the athletes look at it, or someone taking photos is positioned.
The other minor enough annoyance is the buttons on the remote aren't the most obvious, there is no single button to reset the clock, instead you have to go through each of the 6 digits and manually put them back to zero. I'm well use of doing that now before the start of the race, but just one more thing to keep on top of.
That's all I can think of for now, I mount mine in the middle of my gantry, it definitely won't break the gantry ha, but I would prefer if I had a lighter clock with was easier and quicker to mount.
http://m.aliexpress.com/item/1932640457.html?productId=1932640457
I'll let you all know what I think of it when it arrives.