I have not tried it, but Reddit and other assessments have been, in order: 1) "Hey this looks like DayZ, what a ripoff" 2) "Wait why isn't there any ammo? Oh ... its all in the cash shop" and 3) "The devs have no idea what they are doing" and 4) "This game can be a lot of fun, but its pretty broken right now".
While I am(was) a DayZ fan, #1 and #4 don't really bother me all that much -- we've all played broken alphas (like, most every alpha out there). That being said, they seem to be in it for a quick money grab, porting an old game into a "survival" game (I've heard it described as an "arcade version" of DayZ) and charging money for ammo, which is apparently very very scare. Pay-to-win stuff makes me very antsy, especially in an alpha, especially from a dev that hasn't had a ton of successes before.