With aluminum I think build quality is largely resolved - it's a well understood technology and unless you are a big dude or really pushing the bike, you probably don't have to worry about safety. It's really hard to say whether it's the right bike for you but I would suggest you make sure that the style of the bike and geometry work for your riding style and trails and focus on getting the best bike fit you can (whether through a local shop or even just youtube videos). All that said, I would trust whatever TandemBear says over me.