It's a fantastic service if you haven't played the games they offer (and some of them are new, like Outer Worlds - using it to play that right now).
The beta client is...well, beta....but I haven't had any real issues with it. Lots of really good games in there.
My only minor complaint is the clunky interface as it tries to sync up with your Xbox Live account.
Thanks, how do you re-use the promo, is it by cancelling?
I've used it several times by canceling and then re-subscribing a few months later. Not exactly sure what the trigger is.
It's also only like $6 after the first $1, and you could easily get the value out of $6 so that's nice.
Just don't forget about that ongoing subscription if you aren't using it.