I don't think there is any positive experience from being a JW that I could not have experienced just as positive or more so by not being one. One can easily learn speaking skills, actually better speaking skills by fully using the school system, taking part in speaking and debates...and being actually counseled by an educated counselor not a window washer.
I can't think of anything positive about being raised in a high control environment/cult...it is achingly suppressive. There were rewarding personal relationships along the way, but that happens anywhere or never...it's not a result of jw.org.
I just spent a fabulous weekend with 3 other ladies who I knew when we were all teenagers and JW, and just recently reunited from FB after 45 years. They were pioneers and one Belthelite. They left way before me and are leading happy successful lives without any hint of JW. But I will tell you...the scars of the cult are deep. Maybe it was living through the 70's and the 1975 debaucle...I don't know. But being raised a JW gives you a special sort of club membership.
So...no.