I had a Champion e350 v10 shuttle bus and was unimpressed with the quality of construction. It felt too close to sticks and staples motor home for me to put my family in.
Schoolbuses are built to a different standard--and are a bit more difficult to convert, but the truck chassis, suspension, motor and trans are usually much more robust.
Shuttle bus drove and handled like a dream, tho. I got mine from Texas, land of good vehicles.