I'm very happy with the Aquara sensors. I'm using them with Hassio and a raspbee hat. It works very nicely and I've just had another 8 sensors arrive. I'm also using their motion sensors to control ikea Tradfri bulbs.
The Home assistant app works fine for normal visualisation.
I've also got them logging to InfluxDB on my Unraid server with some pretty Grafana visualisations. It all works very well, is cheap and doesn't rely on an offsite service.
Off topic, but I've been meaning to try Influx + Grafana again (couldn't get it working the first or second times I tried). But I haven't tried on the Unraid server, I was trying to get it all running on the Hass Pi. Will try that next.
It was pretty easy. I also have a wee bit more storage on the server :)