Worth the money if you really care about temperature and humidity. I used the DHT11 for our chick incubator and typically had to add up to 20 to each DHT11 humidity reading to get it accurate (compared to two external standalone temp/humidity sensors). . I got this Si7021, ran the example code from Adafruit and it immediately showed exactly the same temperature and relative humidity as my Nest controller on the wall. Currently, it is used in the incubator very reliably, quickly and accurately. Yes, you have to solder the pins, but I'm a total sucker for soldering and managed to do it, so you can too.
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