Are Nitric Oxide pre-workout drink mixes safe and "worth it"?

I havent been lifting long enough but i know that long term effects are small liver damage and slight kidney failure.. One of the best supplements ive taken is N.O Shotgun it works really good, i almost doubled my bench press in 3 months from wen i started benching. whey protein doesnt do anything bad for your body in fact its the other way around .. I would really recommend N.O Shotgun and PreSurge Unleashed (powder form) there both great and Amp Wheybolic extreme 60 from GNC for good whey protein