Only one of my accounts (main) will remain VIP (so it's possible for me to test any issue or anything that might be VIP exclusive). The other account only went for VIP to help pick up a second Flying Nimbus so I could grab some glamour shots in there along with characters from other accounts; so they will be returning to Premium once their VIP runs out.
Personally, I don't believe the cosmetics is really compelling enough this time around for VIP. But that's just me. The Flying Nimbus was definitely worth a 12 month VIP. The discovery bonus is... in a weird spot. In theory, it's definitely useful, the only issue is, you really need another 3 more years for it to reach 5% before it really becomes noticeable, and we're not even sure they'll continue to offer up to 5%. And that's not all, we currently don't have enough tests that would suggest it is working due to limited data samples thus far and the small bonus amount (1%).
So, yeah. If not for continuation for VIP testing, I wouldn't maintain the VIP on my main account.
Now if VIP 2, 3, 4, or 5 would offer low level (ground bound basically) "flight" in the traditional sense (Superman flight mechnics), like an invisible "mount" that causes the rider to look like they're flying akin to Superman (and banking when moving and turning) or hovering (when not with forward or back motion), I'd throw everything into getting that.
J1NG