The shifter was a little sloppy. I expected it to be very precise and easy.
Speedhub has the undexing in the hub, not the shifter. Actually that makes shifting more precise, because you can not misaligne the indexing. Spin the shifter however and the hub will be in a gear. (This is great when the cagle become sloppy and it is what enables the Rohbox to exist.)
But the feeling in your hand is quite remote, it has to feel through the cables. For hand feel it's important, that the cables don't have play (shifter wobbles back and forth), but also are not too tight (shifter spins without noticable "bumps" for the indexing). Also of course quality cables and outers with no compression and little friction as well as routing as short as possible and with few bends and no sharp bends. And then there are different handles for the shifter. Maybe another one gives you a better feel. There are some out of aluminum instead of rubber, this could give a "sharper" feel to it. I sometimes grab the stiffer "top end" of my original rubber shifter for better feeling.
It was difficult at times to shift. You have to take pressure off the peddles before shifting. I'm not used to doing that. I'm not sure how you can downshift while cranking up a steep hill.
Yeah, with pressure on the pedals it resists shifting. If you force it anyway, it may not disengage all the gears and you end up at a higher speed than you wanted. (I m told this is a protection method to prevent multiple speeds being engaged while turning, which would create big stress - and stop your pedaling.)
It's easier if you are not trained for "round pedaling". It you are a "stomper", you have a pronounced dead point with ine leg extended and one compressed. At this point you could quickly shift and when getting used to it, you can momentarily stopp the pedaling completely for just the tiniest moment. A precise hand feel from a well set-up shifter / cables should help to increase the speed of a precise shift.
When it is so steep, you will significantly lose speed in the moment of shifting, you might want to just shift two speeds at once.
There is an alternative shifter that uses paddles on left and right sides of the handlebars. It's called Gebla Rohbox. […] It's about $500 - $600 upgrade.
I am thinking about that one as well (for another bike). I don't really like twist shifters and how to integrate them into a cockpit. I think you should be able to use about any not indexed cable puller that returns. They sell some modified shifters and brifters that are a bit expensive. Your upgrade cost includes those? I wonder if you could just use levers for dropper posts or even brake levers or anything similar. I think you could improve the cost a bit by using something more readily available, especially if you would import a modified shifter from Germany to the USA. Rohbox itself I see at €219 (including German taxes)? Add two non special levers and maybe the cables and outers. Less that $300 including shipping, excluding import taxes?
There is also the electronic Sternshift, starting from €700.