I reviewed MixChecker in the
July eZine. It's actually rather handy. As to the price, there's an
interesting article about what went into making it on the Audified web site. Audified's main thing is broadcast-related software.
However, bear in mind this is not the same as something like the Focusrite VRM box; it's not about emulating specific devices, but a representative device. For example the smart phone simulation doesn't sound exactly like an iPhone or Android, but the characteristics they have in common.