I came across a page, below, which has ported the sample code to a more Arduino-friendly format. I’ve tried the code from this page with the Seeed brick, and it works fine: it gives the same results as Seeed’s sample code.
The page also confirms what others have found: temperature and humidity returned by this brick are always rounded to an integer (e.g. 29.0%, 22.0C), since the underlying DHT11 chip is low resolution. The example in Seeed’s datasheet may be taken from the higher resolution DHT22 chip.
sheepdogguides.com/arduino/ar3ne1humDHT11.htm
Dan.