Yes, all software. Done in Christchurch NZ by a guy who is a lead satellite repairer for the LR Dealership there. It took him two years to get the coding right. Did a D3 first, then my truck which he built for himself. But his personal plans changed and I bought it. He's done some more D4s since. The addition of 18" 33's gives me a total of around 5" with "off-road height" still available. But that's really pushing the articulation so best used for getting off a particular rock. Downside is if I choose a terrain response that requires ORH then I have to wait for it to lift, then send it back to normal height. By then half the convoy of club* trucks has headed off down the trail and the other half are behind me cursing modern Land Rovers!
I would recommend Some Lucky8LLC Metal Spacers if you are going for more than 2" of lift. It is more expensive, but for the already sketchy reliability of the air springs, more and more electronic lift puts less and less comfort and articulatetion and more and more stress on the parts. I know there are also people who swear by lift rods, but that's my two cents.
More floaty with a lift? Really? I haven't heard that from people but mostly talking about the L663. If that is the case I may look into a one or two-inch lift for my D3!I believe the supposition was that no hardware (lift rods) was employed on the lift in question, strictly software modification.
I think the air suspension is only perceived as unreliable as it is because these trucks on the road haven’t seen the requisite service and may be as old as 16 years with original gear. That being said, lift on my RRS felt great and original, but lift on my D3 feels noticeably more floaty.