Well, my XM-3500LI just arrived yesterday. The box and pallet had pretty extensive damage. Large rips on the box and quite a few slats were out on the pallet. One of the tie-downs on the rear wheel wasn't tied down to anything (although it didn't look broken, just not connected to the frame.) The metal frame seemed to be OK, if a tad lopsided, though. The bike itself had some damage on either side of the front cowling and the bottom right (from the driving perspective) plastic piece was somewhat damage and mostly broken off. Also the lower right foot rest was missing one of the screws and I noticed, after removing that plate, that that lower plastic panel was also missing at least one of the screws that would normally hold it in place. One of the headlights didn't work on low beam, but I later took it for a spin, just around the block, and it came on during the ride. I guess the bit of vibration from that reseated it properly (unless it was a power saving thing?) It also has the brake chirping on at least the front brake and I'll try to take a closer look at the back brake a bit later as well.
I opened a ticket with Xtreme about those issues, and if the experiences of others recently reporting on such things is any indication, then it shouldn't be a problem getting those basic body parts that were damaged. (The brake thing I'll just have to see what I can work with thanks to some of the other posters here.) None of them prevent the scooter from running, but I definitely need to look at fixing the brake problem before I feel comfortable using this as a commuter. And I do want to do some of the recommended battery conditioning recommendations others have claimed by riding it a few miles, then a few miles more and so on with recharging in between.
Unlike some of the other folks who reported that their bikes were pretty much fully charged, this one registered a very low charge on the gauge on the display panel. It pretty much took a good 3-4 hours before the charger finally turned off when I started charging it up, so I think it was definitely low. I don't know if that is any indication of anything, mind you, as I don't know if they are being shipped that way or what.
I've not found a good way to mount the bicycle speedometer I bought, either, but subjectively it has pretty good pickup (although this was only on little neighborhood streets with stops at every corner and at a guess I never got it about 25-30 mph.) The throttle is going to take some getting used to. It picks up and goes pretty quick and it's very hard to fine tune a cruising speed with it. I find it's a lot of throttle on/throttle off to try and maintain a speed, but we'll have to see later how that translates on some of the roads I'll be driving that have longer stretches on them.
The scooter was also a little heavier than I expected and the overall frame feels pretty sturdy to me. I'll look at taking off the body panels and tightening everything down before using it as a commuter, though. I noticed several of the screws and such were a tad loose so I'd like to make sure nothing important is loose.
Now I just need for my helmet to finally get in, get the paperwork from Xtreme (that's requested in my ticket as well... I wish they would just automatically mail that to you when they ship the bike or something. It's very frustrating to have to wait to get the needed paperwork like that!) and take a look at doing the rest of the basic setup. I'm thinking I may also just have to go the GPS route, too, since the bike speedometer doesn't look like it will be too easy to mount (at least not for me.)
Sorry for not having much to add on the riding or performance data points. Hopefully I'll have everything in place to really start using this in a few weeks and can provide some more information then.