That's pretty good!
So for an extra $200 you get a full-canvassed suit that is made in Japan rather than AUS. I bet the finishing and construction of the collection suits are superior as well.
Having said that, even if they are very good value there is still the alteration costs, which you mentioned. Whereas something like P Johnson, the alteration costs are built into the price of the suit. Perhaps it is like that postage dilemma a few pages back - the prices shouldn't be separated.
Did you see how many collection suits they had on offer?