First off - it only seems to be available for CLASSIC Ram - not the NEW (DT) Rams. At least, according to K&N's Website.
Uses a manual KNOB (instead of software or app), which means you need to find a place to PUT THE KNOB. I can honestly say with the PedalCommander, once I found the "perfect setting", I haven't been in the app in months. It would probably be similar with the K&N Unit, and after you're happy with the setting, you could just tuck it under the dash somewhere. I'm just not that enthused with devices that use more wires than necessary.
While the manufacturers "say" that it won't void any factory warranty - we're pretty well acquainted from stories here, that FCA will do so at the slightest provocation. It really doesn't do any more than modify the signal coming from the sensors on the pedal.
I have a DT Tazer and PedalCommander - BOTH COME OUT when I'm going to the dealer if the truck has to go into the shop. Takes about 2 minutes to pull both (and re-install later). Not worth the chance it's going to end up in some service ticket notes. The Magnuson Moss Act likely DOES NOT COVER add-on electronics designed to modify engine performance. Easier to take the damn thing off.
Totally happy with my PedalCommander - and group buys come up one in awhile to soften the blow.
Rick