Do not buy it!
I used Astrill in China for a fairly long time (2013-2019) and it used to be excellent. However, in the past few years, something has changed and it is just total rubbish. I spend half my time trying to find a server that actually works. While using my Chinese data/SIM abroad, the VPN just doesn't work at all, couldn't access Googlemaps etc. could only use if I was on WiFi. Customer service is appalling, prices are extortionate. DO NOT BUY. Look elsewhere!