Truly Amazing! But be wary for those with little/no biking experience or those with low fitness levels.
First of all, our guide was a true expert. passionate and as keen to tell us the historic interest behind the culture and temples, as me and my partner were to absorb it. We did a 3 temple tour with some jungle and off road sections.
Cambodia is humid, that's obvious, but biking 25m on and off-road in 80 humidity has it's tough bits which isn't really set out as expectations beforehand perhaps ignorance on our part!. For us, it wasn't a jaunt round the countryside, So just know what to expect here! You'll feel a sense of accomplishment and will have seen the countryside and learned the historic nuances of Cambodia.
But you'll be red faced and panting for your work!
I'd love to do it again, not sure my partner would agree :P