I've got a stick in my '13 Rubicon with Trail Dash... works exactly like I want but probably not very useful for non Rubicons IMO. Though I tried the different tunes, for me I like the stock tune best for driveability. I didn't try the economy tune for effect. I found the "crawl" mode too difficult to get used to as it drastically changes the throttle response. The 87 tune created a "seat of the pants" improvement in performance as again, throttle response seems better, but I found it too responsive for my trail uses so I stick with the stock tune. If I was a pavement pounder, I'd probably use the tunes available.
As far as the other goodies I actually bought it for...
Rubicon sway bar disconnect up to 30MPH even in 2H.
Rubi E-Lockers available in 2H, 4H and of course 4L. All up to 30MPH
Tire Pressure monitor override.
Electronic inclinometer is actually pretty good as it doesn't bounce like the analog oil filled units I've seen.
Tire size and gear ratio computer corrections.
Read and clear diagnostic codes.
There are numerous vehicle metrics that can be monitored, but I don't use it much for that. You must cycle through different screens for all the data available. You have the ability to pick and choose what you wish to display per screen.
It has a high idle adjust but unless you are extended winching or perhaps have engine driven onboard air service, I've not seen a use for it.
There are several maintenance reminders programmable like oil changes etc but I don't use 'em. There are more bells and whistles than I can remember or use. All in all, if you've got a Rubicon, you may really like the TD as I do.