I'm still pretty new to this (4 months post OP), but this has definitely been the best decision I've ever made with regard to weightloss.
I had GERD prior to surgery (which is why I chose RNY vs Sleeve), and it's completely gone! I haven't even needed a TUMS since having the surgery! I haven't had dumping, but I also don't crave sweets anymore which seem to cause people to dump. I have had "the slimes" which is when I eat just one bite too many, and I end up hypersalivating, and sometimes throwing up. That hasn't happened in over a month though, probably b/c I'm better at listening to my body.
As for loose skin, I'm sure I will have it, and I look forward to getting a tummy tuck/boob job someday!!