Hey BigM,
I have that jack adapter as well.
What I love about it, is that it is always with me. That's a nice piece of mind to have when 6000 miles from home.
I also have the other jack you see on eBay, that bolts to the bike.
(more like clipping to the bike with nuts and bolts to snug it into place)
The bolt on adapter is better for balance. It allows movement of the jack front to back to adjust your balance.
Last year I rebuilt my bike. I would end up torqueing the bike one way or another, and it was always very stable. I could climb around on it.
With the in-place jack, your jack location is fixed under the rail you see in the picture you linked to.
The balance isn't bad, it just isn't as good as the other (bolt on) jack adapter.
I plan on keeping my Valk for a lot of years. So I'm going to keep them both.
I had planned on selling the bolt-on unit, but I like it for any serious work like removing the front end. I know when I used the in-place adapter on a big front end change (new rake kit), I felt like I had to be very careful around the bike while it was up on the jack.
Each jack serves a good purpose, I won't leave home without the in-place adapter, and I'll use the bigger sturdier bolt-on when I need the extra balance and safty margin.
Happy Father's day!
Glenn

