Started use Astrill 4 months ago, at the beginning was thinking of try it only coz it's one of VPN that work on Mac system, but the fast speed surprised me! this is one of the reason I continue use it, even through it was not so stable at the started but after report the problems, they fixed the bugs and updated the software often, now its working prefect on my MacBook. Also you can see they're improving all the time, that's why I keep using it. Before use Astrill I used to use Vadalia but very soon it's been blocked by the local gov. here, haven't get this problem with Astrill so far, hope it will keep work on.