Tubed peep here!!!! I shoot a LOT, and be it a set of VT's, or WC strings, after a few thousand shots, I think they all stretch just a little, and if that peep rotates at the "GOLDEN HOUR," then I'm gonna be pissed. You really don't loose enough FPS to notice, just keep the strings well waxed, especially up where the tube is gonna smack it a little, and it'll always be straight, and you'll never wonder. If some of your MONEY $hooters are still using them then there's a reason!!!!