Depends on what quality of the silicone wiper you use. Some boneless silicone wiper can't completely wipe the surface of the windscreen as it jumps. Get a quality silicone wiper that can last you longer.

Rain-X is definitely make a difference and you can see the water beding effect after applying it and when the rains come, it will swirl off the direction of the wind goes. Lesser energy needed to operate the wiper.