I also have the evaluation kit and using the SPS30 software that can be downloaded from their web site it gave very accurate. Used in 3D printing to see what the environment is like.

I have been using this sensor with a Raspberry Pi. The example code works reasonably well and isn't too bad to set up. It seems to be a little harder to use it on an Arduino, but still possible. This sensor is far more accurate than any other PM sensor I have purchased in this price range and has extra particle count bins and is able to detect particles down to 300 nanometers.

I got this to determine if our home-brew air purifiers (https://www.youtube.com/watch?v=kH5APw_SLUU) were really working while we had orange air from the recent wildfires. Very easy to hook up to an Arduino Uno R3, though to hook up to esp32 I first needed to modify the Sensirion example software to use the esp32's second I2C channel since the first I2C channel was talking with the OLED on the esp32 dev board. The Arduino /was/ able to read the number concentrations as well as mass concentrations using the I2C interface, which the Sparkfun description says doesn't work. The outdoor particle mass readings from this sensor were right in line with the ones posted on purpleair, and the indoor ones were much less. So, were the home-brew purifiers working? As it turned out, yes; the rooms with the purifiers had far lower particle mass readings than the outside air, and substantially lower readings than other rooms in the house. (Unfortunately, I also discovered that the house is remarkably porous to particles 2.5um and smaller.)

This little guy is half the size (thickness) of the Honeywelll HPMA115S0 and it gives 2 more points of data (1 µg/m3 & 4 µg/m3)! Not only that but it also has self cleaning which the Honeywell does not have. I'm hoping after I test this dude out I can see if it has a standby mode which the Honeywell has some serious issues dealing with make it not nearly as useful as it could be since its almost always running.

Will add on to what other reviewers have said about the connector, it falls out very easily so you'll want to get creative about securing it onto the unit.

Otherwise, it so far seems to be a significant upgrade from the SDS011 sensors I was using before. The lifespan improvement alone makes it a better buy, but the auto-cleaning, additional concentration measurements, quieter fan, and smaller footprint are all nice bonuses. The only feature downside is that there's no obvious way to attach this to a hose to measure e.g. outside air quality.

Love the Sensiron products, and this is a great particulate sensor. Easy setup (i2c for our purposes) on PI and Arduinos. Great data. Highly recommended sensor.

A student was working with the wires that plug into the sensor and the red wire broke right off. Nothing we can do (glue etc) seems to get it to stay. We may have to strip the wire and reconnect it somehow. That just seemed a bit too fragile. Other than that, still don't have the full assembled air quality monitor fully up and running. We are having an overheating issue, but that is likely due to our circuit board (not the sensor).