JCOVE brought my laptop to its knees, so I can't really give a proper review. You get a small map of the UK training area (there are a number of training/qualification missions), and a larger Iraq scenario map. There are some missions ready to play and the community is already cooking up more. You get a sh*tload of UK gear, including small arms, armour, vehicles and helicopters, even Harrier and Tornado jets. OPFOR gear, especially in terms of armour, vehicles and aircraft is somewhat more limited. You can't import mods or ArmA/VBS assets; you get what you get. But then again, it's free. Otherwise, it's classic BIS, warts and all.
Pro Tip: There have been some problems with some of the download mirrors and conversion to .ISO image. I just downloaded the torrent from the website (requires free registration), and mounted the .nrg image directly with DAEMON tools. This works.
Also, I dare you to to shoot one of the other soldiers during firearms training. Just don't come crying back to me when you have the face the consequences...