LS4 Performance - What do you guys think of this ECM Tuner

Hey, i am new too this forum, i just bought my 08 gxp back in april. I have read through this forum pretty throughly and a few other ones as well and used your guys advise to install my magnaflow, hogan downpipe and flip my moter mount by myself. o and not to mention my k&n charger. Anyway i am doing my zzp shift kit tomorrow and i was looking online and saw this.

http://www.vectormotorsports.com/index.php?page=shop.product_details&category_id=28&flypage=shop.flypage&product_id=10&option=com_virtuemart&Itemid=28

It is a ECM tune for our 5.3s, what do you guys think, is it worth it? i dont really wanna go out and buy the hp tuner cause i think i will mess my car up with it.

If you don't want to get into HPtuners the Vector tune should probably be your next choice. Don't have any experience myself but it seems to be mentioned alot around here.