I am not really sure about this. In my opinion it would be worth, but I am interested in flying.

So if you - even when you are flying a lot - interested in aircrafts/interior/service and donīt have the First Class experience every day I would do that. I would try this, especially if you are not a group of 2 or four people.

In that case it may be a bit expensive compared you have to pay all that class differences (2 * 100 Euro or 4 * 100 Euro) for yourself.

As anytime in spending money the best is to do what you impulsively decide. And if 100 Euro do not matter in respect of all of the costs of that tour the decision is an absolutely go and enjoy. @:-)