they arent bricking, they formatted their devices, until i can get a clean dump of ALL the partitions i cant do anything for em. i had posted warnings of re-partitioning :/.
that attain was rooted via an exploit, put simply an exploit that isnt going to go public any time soon. everytime an exploit gets released a few things happen, programs like superoneclick grab them (which then everyone doesnt understand why superoneclick doesnt work and not the exploit.... but the big thing is then samsung/lg/htc all learn about this exploit and patch it (sometimes scarily quickly). and then an ota happens.. and guess whta now people are back clamouring for an one click root and a new exploit, and the process keeps repeating until there are no more exploits to be found.
so yes one of the ones we know of works on your phone, rather than getting mad that we dont publicly release it. be glad that we used it to root one phone and since you have an open bootloader because you bought a samsung it means you will NEVER be blocked from root again. when some big name phones come along like the droid 4 exploits get released, but for a midrange phone on metropcs... sorry its not worth losing possible future phones rootablity because you want a one click.
so again back to what i said
if you want a root exploit find one, or use teh pre-rooted tar
P.S. regardless if/when updates roll out for this phone youll root and then be forced to use cwm/odin to re-root anyways ;P