Impala,
I can't add much that hasn't been said, so let me share something personal.
Me - Raised a JW from 2 years old. I served in the congregation, pioneered (90 then 70 hours a month in door knocking), served in foreign countries, etc....
Recently, I decided once I went further into the doctrinal rule regarding refusal of blood transfusions, some blood products, and some medical procedures involving blood.....that I was WRONG for believing it. I shared it with a couple people, and I was almost disfellowshipped JUST FOR TALKING ABOUT HOW I FELT. I am not kidding.
So I shut up about it, and stopped attending. I disagree with many other things now as well. I have lost friends (who simply know I no longer attend meetings), because I am considered "weak". Unless I come back and change my views, I could be disfellowshipped for a variety of things.
celebrating my toddlers birthday
accepting a blood transfusion
publicly disagreeing (even respectfully), of the faithful and discreet slave.
Voting (yep......voting)
Talking with disfellowshipped people (for real.....this one is the easiest way to get kicked out)
Just TODAY (I am going to write another post), I spoke to my mother, who kind of breached the subject of meeting attendance. I was careful about what i told her, but the short story is she started crying, said the blood of my wife and babies would be on my hands if I didn't turn back (sincere plea, not a curse), and shejust left my house. She even suggested that by not attending meetings, I had "disfellowshipped myself".
Most JW's are good honest people, and are probably not very happy about the more dogmatic and unloving principles they hold to.
My advise, is not to approach them like they intentionally witheld information. My advise is to pick a subject (blood, voting, birthdays, shunnign for not falling into uniformity of thought), and study it. jwfacts.com is 100% accurate, but do not tell them where you got the info, because it will immediately be dispensed with. Then, tell them you were told some things, and you wanted to run it past them because in three years they haven't mentioned it. Be honest, and expect the same honesty in return.
I hope they will remain your friends afterwards, but I would emotionally prepare to possibly lose them.