We don't agree with the assumption that a premium product must have a premium price and so we've priced Simgua to be affordable for every budget. Also, we sell one version of Simgua. It’s that simple. You get everything that our competitors segment into a dozen different products. Macros, arrays, Excel export, Visual Basic equations, our unique component mechanism, and much more; it’s all there for one affordable price (with a big discount for academics thrown in).