Love it.. works great and feel way better when leaving my motorcycle unattended.. works perfect and tough and easy to carry along with.. good for the garage when not there also.. I actually have 2.. one smaller version with no chain adapter to carry with.. then the big one with chain adapter hooked to the floor.. I feel perty sure my motorcycle will be there when I return..
Both hooked up and working in the photo

The XX-15 is a sturdy disk lock that I use on a HD FXDL. I mount it on the rear, utilizing the slots in the disk. The lock's post is too larg for the disk's round holes. I sought the most secure protection available. Also this model (and the XX-14 & XX-10) has an additional security feature that hold the bolt to the opposing side - it can't be pried out, as can less secure models.
Tip: verify lock model to order on Xena site. Measure holes in your disks, and match to locks you consider.
I'm very happy with this lock. I use the XX-14 on my RoadStar Warrior; and I'm very pleased with that lock.

I checked, and this model is listed as compatible for a Harley touring bike (basically the listed all there disc locks as being compatible with the touring line). I bought the XX15 specifically for the longer reach throat that it provides as I thought it might be more flexible in use. Turns out not a good choice for this bike. First of all, it doesn't fit my rear rotor because of my V&H Oversized pipes (my mistake). It sort of fits the front rotors, but too much excess throat. Basically the alarm is not connected to the lock/unlock functionality. It has a sensor that arms after 5 seconds when it 'detects' the front rotor is in the throat of the lock (near the lock pin) (So you have about that long to get it on the rotor and unlocked, and about the same time to get if off to disarm). But this lock has such a long throat, it is (easily) possible to position this so it will never see the rotor in the throat (near the pin) and it won't arm, or if it does arm, a person could simply move it on the rotor so that part of the throat no longer sees the rotors and the alarm portion will disarm. So the alarm portion is unreliable on this bike. I would still consider buying a Xena, but just need a different model for my bike.

Works as it should most of the time. Sometimes the alarm doesn't set, which is no big deal if I am at the office where I have a direct view of my motorcycle. At school though, or where it leaves my sight it can be worrisome. Normally the act of locking and unlocking will "wake" the alarm up, Sometimes a good bump on my boots before locking it is needed.

If you're near any sort of window, or you're in any sort of air conditioned building, you WILL not hear it. Batteries are rather expensive for it, Works like garbage when it rains, If you dont use it daily, it goes into sleep mode and it's hard to wake up, It won't trigger every time it's put on the rotor and you have to play with it a bit, and worst of all, the tilt sensor is trash. Last week i came outside to find someone with their friends sitting on my bike. The alarm only went off after they dropped my bike on it's side.

Thanks for nothing Xena!