I have owned the 15.4 Touch Bar model since 2016, I typed on it before I bought it and I knew the keyboard wasn't as good as my 2012 15", but, it wasn't as bad as some reviewers made it out to be, I'm glad I bought it before the bad reviews. The 2016 was a huge upgrade from the 2012 and I can say the 2019 is a huge upgrade from the 2016.There is no one feature that is absolutely night and day from the 2016, but, every function is better.  Screen quality and size, performance, keyboard (mostly non-touchbar ESC key for me), battery life, speakers, mic and thermal, it's a bit quieter than the 2016. If you have been holding out because you like the 2012 keyboard travel and feel, the 2019 travels further and feels better.I can't personally feel the weight difference in my bag, between laptop, accessories (Jabra speaker being the heaviest) my bag weighs about 9lbs so if it's 9.3lbs I can't feel it and once it's out of the bad I don't tend to move it around. It is a big larger, but, still fits in my small 2 pocket Tumi laptop bag, so the .25" doesn't bother me either.I'm looking forward to seeing if it's as durable, I got over 300 full battery cycles on the 2016, I expect the same from this unit, but, only time will tell.Hope my experience helps.