I haven't ridden a bike in probably 4 or 5 years now. I'm not looking for a high performance bike, or anything fancy. I just want a mountain bike that's going to last. Something in the price range of $400-600. In the past I've had CCM and Supercycle bikes, and they've been terrible. The guy at my local bike shop recommended an Opus Sonar, which is $520 http://opusbike.com/en/bikes/mountain/aluminum-26/sonar

I'm wondering if Opus is known to be a reliable brand in bikes. The Sonar is the cheapest mountain bike they have at the shop. I've never heard of Opus, but I couldn't find any negative reviews about them. Would it be worth the extra money to get a Specialized bike instead?

I'm 5'9" and 150lb