I waited a week or so to get this, as my graphics card is a little too old to run the second.
And let me tell you what, that week or so was well worth it.
For a eight year old game, this is one of the best shooters i've ever played.
Aiming down the sights is a must, rifles have to be re-bolted after every shot, a few bullets can kill etc.
Tanks feel very natural as well, you're either a driver, gunner, or a machine gunner, there's no be all end all position in said tanks. The driver and gunner have to work in perfect unison to survive against another tank and reloading times can be a killer.
The maps are big, without feeling too oversized.
I've yet to play the Darkest Hour modification but am downloading it at this moment.
If you can't run the second, or missed out on the free day I highly reccomend spending the 10 bucks on this. Even if the servers aren't as populated, graphics a tad out dated and some other very minor things, you won't be dissapointed.