With the prices what they are, I have REALLY been wanting to make the jump to medium format lately. And I can't help but notice that the Mamiya RB67 is about cheap as you can get in medium format without going with a Holga, Diana, or something by the Lomographic Society. This, of course appeals to me, along with the larger, detail-packed 6x7 frame (vs, say, 6x4.5). Of course, this can be increased to 6x8 as well with the power back. But it seems like most of what I see here about the RB67 is negative. I hear everything from stories of poor quality lenses to poor lens choices to the camera being SO heavy it is only suitable for studio use (I guess I've never seen one in person). Are all of these things basically true? Would I REALLY be better off spending a few hundred more on something else (because nothing else truly comes close when it comes to cheapness)?