My badminton partner is looking to upgrade his racket but he is in dilemma whether voltric 70 is worth the price to pay for as he is intermediate player. He plays mostly doubles and is intermediate level player. He doesn't want a stiff or too flexible shaft. He wants to improve his attack without compromising too much on defense. Shortlisted options are: Votric 7 - £67 Voltric 70 - £119 Arcsaber 7 - £110 Tantrum 300 - £60 Any recommendations please.