These are my personal opinions based on my background and training experience.
This course is online.
This course materials included a vpn connection package.
The class/lab is unknown.
The lab environment is NOT shared with other students as far as the VMs are concerned.
At the time of this review, the course prices were listed as follows (Check the web site for actual prices!)
PG PLAY: 3 Hours per day is Free
PG PRACTICE: Unlimited time and more benefits is $19 / month USD
"Practice your pentesting skills in a standalone, private lab environment with the additions of PG Play and PG Practice to Offensive Security’s Proving Grounds training labs. Students will receive a taste of what it’s like to work on PWK with PG Play, featuring three daily hours of free, dedicated access to the VulnHub community-generated Linux machines. A subscription to PG Practice includes all the features of PG Play plus additional Windows and Linux machines developed by OffSec experts with unlimited time on any targets. It even has retired OSCP exam machines for students to try their hand at. Learn, have fun, and sharpen your hacking skills with new machines added monthly."
PG Play was free for 3 hours per day. I figured I would sign up and check it out.