Anyone have these or have experience with this locking hub conversion? Its pricey but can't find anything else like it and teraflex recommended it.

Jeep Wrangler JK Spyntec Overview | Spyntec Industries

 

These were talked about quite a bit several years ago when they first came out, but I have actually only seen a few posts of people running them. With the cost, and the change in bolt pattern (adapters/new rims), more people just opt to sell their stock axles and buy 60's that come with locking hubs.