After the weekend trip with the Ocean to Ocean group, riding two up, and hitting speeds up to 90MPH on a couple of occasions, and 80MPH fairly often (not with them, but later, after leaving the group), I report no problems with wobble. However, I do notice how this bike is effected by turbulent air, cross wind gusts, etc. The fork mounted fairing is the culprit for that. I was running 40 PSI in the rear tire, 15PSI in the shocks...I weigh about 180 and the GF is about 115. The only time I felt a little "wiggle" was taking a left handed sweeper on an interstate "ramp" changing from I-20 to I-75 in Atlanta...it's a pretty tight curve...was probably going about 65 and noticed a little "shiver", but it felt like it was related to the suspension. Maybe one up will be different...I'll soon find out, I'm sure. I did remove the little smoked "wings" that are attached with three thumbscrews on each side of the fairing...seems to improve the aerodynamics considerably. I'm sure they'll be nice in cooler weather, but for now they're staying off. A little thing like that made a big difference in how the bike felt at speed, IMO.
Honestly, I am shocked at how well such a large bike handles, at all speeds. The only time I get nervous is when I'm about to stop...the beast is heavy!!!