Older MBs, from there era when they were writing instruments designed for daily use, are very good pens. Some, such as the mid-60s modernist designs (12, 14, for instance) still represent good value. It's not to hard to purchase an MB, try it, and sell it on if it's not to your taste. As with Rolex, a preowned MB (149, 146) tends to hold its value.
Contemporary pens are slightly inferior to vintage, and tend to be overpriced.