I can't help you with the Darwin (no personal experience) but the price seems high for something to just look at and not shave with.
As to the Gold Tech - you should find that to be a very smooth and gentle razor. If you find it a little mild, just plan on one extra pass or some touch up. Resist the urge to use more pressure - that will certainly lead to irritation. Some guys like using a Tech with a super-sharp blade, like the Feather.
Brad - OGA
You must be willing to do the things today others won't do . . .
In order to have the things tomorrow others won't have. - Les Brown