I'm aware of the reduced fees with membership pricing. Problem is, unless you're using them constantly, it's a huge waste. I don't roadtrip all the time, so a $4/month fee eating away at that will erode every benefit I get from the cheaper fees.
Per the 85 and 90 pack issues, sure there seems to be some problem with them... especially when supercharged repeatedly. Unclear what the actual issue is though. Doesn't seem to impact every other line they offer though (70, 100, and all other variants). Might just be the actual degradation though.
It's funny, because I haven't seen huge news about the Nissan Leaf problems. They have garbage degradation curves and haven't fixed it after many battery iterations... besides the lawsuit for 2011-2012 model years, it seems everything else is considered 'OK'.