I invested in a plus setup, convinced by what I’d read that it would be the best ride ever (2.8 Minions)
There were some good traits; cushy and forgiving over rocks and roots, and confident cornering.
However, maybe it’s just me but I couldn’t find ideal tyre pressures* to suit all terrain. My riding involves a fair bit of covering non-technical terrain in order to get to the technical stuff, and the higher rolling resistance, lack of accelleration and more ‘muted’ ride far outweighed any gains for me.
Strava confirms that me on 29×2.3 is always faster than me on 27.5×2.8, and returning to 29″ also felt more fun and poppy, so the plus setup got sold pretty sharpish.
* I’m a simple soul who likes to set and forget. Agonizing over perfect pressures on a trial and error basis is not in my nature. Maybe that was my downfall.