My 45% ovality EggRing chainset being used to climb a 44% incline (rises 44mm for every 100mm forward).

The main difference when using this set-up is that you're more likely to get to the top of the hill and will be less tired when you get there.

They work by reducing the acceleration during the power-strokes and reducing the deceleration through the dead-spots. This efficiency gain is most evident in "high drag" conditions: steep hills, headwinds and soft ground etc. The efficiency gain on flat smooth roads is little or none.  Also, traction is improved and suspension activation (bob), is reduced.  

Only a 5 year bump.

Naice. 

As the chance of a passing car knocking me off, seemed rather remote I thought I would risk cycling off-road without a helmet one more time. I do recommend that people wear helmets but after riding off-road for 25 years (with occaisional breaks), I now hardly ever fall off.  I am however very good at jumping off before I fall and even better at knowing how to stay on.  In fact my bike was designed with staying on as its core ethos.  It's never killed my knees either.

The Cleland Riding Philosopy link:

 http://www.james-walters.net/cleland/cleland-philosophy.html

Clearly you're a risk taking maniac.

Ok I'll wink this time