I personally like RH's. It kinda annoys me to have some RH and some not, so I RH's out my DialgaChomp. Plus, it gives you something to trade for when you don't really need anything, keeping your eye sharp for bargains. I really like having the RH's to play mind games with the opponent, like posts before me have said. If you want to put these into effect as strongly as possible, position yourself at the table with the light behind you, giving your opponent the glare of the cards. This not only gives you a powerful, superior mindset but it also subconsciously makes your opponent feel his cards are inadequate compared to yours, making him more apt to lose faith in his deck and misplay, scoop, or just lose in general.