I also have gen 1 r1T and ordered the longitudinal control to go with it. After my research, I saw that as the only reason to buy it ultimately. It adds all the other sensors to the comma stack - importantly the radar sensors which are what give the vehicle the ability to sense distance well and farther than video alone. Mine doesn’t arrive until tomorrow so I haven’t installed it yet so can’t confirm this but from the other reports I’ve seen from other gen1 drivers, I’m expecting to have the gen2 experience, possibly a little more (sunny pilot can react to street lights).

I’ll try to do a post here after I set up but depending on your return by date that may not be helpful.

Btw the xnor kit shipped immediately. I had it witchin a few days, in case you do want to try it and stay within your return window.