My Triumph touring gel seats (separate, not combo) aren't that bad. Much better than stock but not as good as a custom seat. I'm fine riding all day on it with just gas stops every couple hours.
If you want to easily go solo then don't get the combined combo seats and definitely don't put in a backrest. Like said, the back rest brackets are not easy to put on and off.
Don't need a back rest anyways. Just tell your pillion to hang on like she were on a rocketship. :lol: