(wall of text. do read)
I haven't been at my PC since SA got released and partially glad because it would have been a complete no brainer for me and it still kind of is. I am going to give it the course of the day to decide. If you can, watch some streams of the game before taking a leap so you know what you are getting into. Let me elaborate.
DayZ was one of the first games in a long time that hooked me properly. The gameplay was so-so and bugs existed all the time but there were a few mechanics that made the experience so addictive. I started playing DayZ the mod shortly after it was released so was fortunate to experience the "old days" of DayZ without vehicles and high end weaponry everywhere.
The emotional rollercoaster I think is what got me the most and is DayZ's strongest attribute and defining feature.
When you die, you die and lose all your stuff - never has a mechanic in a game been so rage-inducing, but so brutally satisfying at the same time. You actually build a connection to your character.
The ingame proximity VOIP - I love this mechanic. Basically if another character is within earshot of your character in game, you can talk to them... But there won't be any visual indication to them that you are talking so you can use this for a number of things eg: scaring guys, negotiating, stealing stuff, distractions, grouping up etc etc. It enhances the relationships you have between other players.
You start with NOTHING - everything you have, you have to salvage and find and look for. This gives a strong attachment to loot and we all love loot.
Not everyone is out there to kill you.. sort of - in the harsh post apocolypse, strength is in numbers. This makes you team up with players of all sorts and build trust.. or not. The lack of name tags also means that you won't know who you communicate and link up with. Makes for some great teaming up and some twists.
Its quite realistic - You need to eat, drink and rest (in Standalone). Your gear takes damage when you get shot, there are item slots and inventory management and you apparently even get tired faster when wearing a motorcycle helmet (but more protection from it etc).
All in all, watch some streams at
http://www.twitch.tv/directory/game/DayZ and make your own decision.
I know a lot of [grrr]bians said they would wait till standalone, but I would make sure you know what you are getting into before purchasing. Its in ALPHA which means bugs will be everywhere. The advantage of picking this up now is that you would get it at a lower price (albeit $30 or so). As the game progresses to BETA later next year and finally full release (who knows when), the cost is going to go up, similar to how ArmA 3 did.
I will almost definitely get DayZ Standalone. I know that the original release window was nearly a year ago and people are mad at Dean Hall, but he followed his vision and was given the resources to build the game as he saw fit. So far, I really like the way the game is looking.
I have chatted to a few [grrr]bians and I know a few guys are most certainly going to get this game. The advantage we would have of having a small crew, as we did we the mod, would be tremendous and I think this is definitely something that anyone who is a fan of the survival/zombie genre should check out.