I have both the Tamiya Enterprise and the MiniHobby Enterprise. The MH Big E is a Tamiya mold copyrighted by MH with Tamiya's blessing. They are identical in every aspect. The only difference really is that the MH model can be motorizied. The only bad thing about this is that the switch comes right up through the #3 blast deflector.
The instruction booklet that the MH is only about six pages and does not give the references that Tamiya gives. Heck, even the airwing is the same as the Tamiya kit.
An addition note: even the MH Battle wagons are Tamiya copies too.
All in all though, I guess the only good thing about these two monsters is the MH price is less half of the Tamiya price. One of these days I plan to do the MH Big E as the Kitty or Conny or maybe the America.
The only real reason I picked up the MH Big E is because the box looked to be a more updated Enterprise. It's not, it has all the same faults as Tamiya.
Well that's my in boxe review, hope this helps!