The felt adds a little bulk, not much. The definition is not quite as good with the felt, it is still ok, just not as crisp.
If you set the tension, you can finger the mod up and it will stay up to grab with the same hand. When you are doing something that may jerk you around, say on a bike or in a boat, set the tension a bit tighter to keep your mod in the case and safe. The cases are motorcycle friendly. The clip is easier to put on and take off, but the other attachment (belt tunnel) is more durable and will not come off without undoing your belt.
If you set the tension, you can finger the mod up and it will stay up to grab with the same hand. When you are doing something that may jerk you around, say on a bike or in a boat, set the tension a bit tighter to keep your mod in the case and safe. The cases are motorcycle friendly. The clip is easier to put on and take off, but the other attachment (belt tunnel) is more durable and will not come off without undoing your belt.