I'm extremely happy with my 400i. I traded a '13 Honda PCX in for it, got a great deal, and have no complaints with the bike. It was like going from a go-kart to Formula 1. The only hacks I have are with aftermarket parts, namely the windscreen hitting the mirrors, and the lack of availability for replacement front turn signals that actually have the LEDs in them. I would highly recommend this bike, and I'll tell you without hesitation, you're going to love it.
On another note, you had it up to 80? I never managed more than low-60s on the Honda, with one wild downhill ride on the sunny side of 70. It wasn't particularly fun or comfortable, but I didn't have much choice. What I'd like to know is, did the dealer actually let you take it out on a road where you could go that fast? I haven't had mine up above 55-57 yet, as I'm carefully breaking it in, and don't want high RPMs yet. Let me get past that 600mi oil change, and get her safely past 1K mi, and then I'll think about those speeds.
I really think you'll enjoy the 400i.