Ez-Fire and Rapid-Fire are similar (flat bar thumb shifters) but I prefer the placement of the levers on rapidfire.
Ez-Fire
Rapid-Fire
I would suggest you do a hundred miles on a road bike, you will get used to it. It's really not that bad. You're just used to the soggy ride from a hardtail MTB. And buy a good saddle, changing from stock to Brooks made it much better (36 mile journey with Pizic Pave was slightly uncomfortable, on the Brooks much nicer for the same journey, and at the end no pain)
Ez-Fire
Rapid-Fire
I would suggest you do a hundred miles on a road bike, you will get used to it. It's really not that bad. You're just used to the soggy ride from a hardtail MTB. And buy a good saddle, changing from stock to Brooks made it much better (36 mile journey with Pizic Pave was slightly uncomfortable, on the Brooks much nicer for the same journey, and at the end no pain)