Feedback on Alex Supra BH rims????

I can get a great deal on a set of supra bh rims on deore hubs and formula qr20. Should i go for it? I heard the rims were only 600g so they are kind of interesting. Im planing on doing urban, litle bit of dh, drops and dirtjumping and i want something more solid then my old rhyno lites. Thx everybody