Never heard of J Tech but sound good.
How is the DB Air?
James is a good guy and sees to know his stuff. He valved and tuned my forks this year and did a good job.
The DBa is really good. Certainly the best air shock that I've used and is as close to a coil shock you can get. The only downside is that you can make it ride badly be fiddling with it too much as I did. I got a tad happy with the compression settings and it was rank. I've now reduced the air volume a d an running the recommended settings for my bike and its much better. It's also quite weighty for an air shock.
2015 Stanton Ti Switchback
2006 Specialized Demo 8
2013 Specialized Allez Sport
1999 Santa Cruz Chameleon
1994 Cannnondale Beast of the East (rebuild still in progress)