None of the gas models are going to impress with their mountain climbing ability. It is a heavily loaded van that was actually built for the working market. The local plumber and electrician don't need speed or lots of hill climbing power. lol
While Hymer Europe owned Roadtrek, they built a "luxury" model called the Aktiv, two cheaper models called Carado, and an even cheaper slapped together in a couple hours (yes really) with the same floor plan as the Banff called a couple different names... Van One... and only sold at Camping World. (most of us suggest avoiding them for purchasing or servicing). One downside of those early models was it didn't have a gray tank and the galley sink just dumped on the ground, which is illegal in most places.
The Banff has an open interior that may appeal to you. It does have a large rear bath, but what you lose with that is that the galley is puny... tiny fridge on the floor which some find difficult. If I were full timing in the van, I would want more "kitchen" space. Pros and cons to every RV.