If you really like the frame design, go for it. Cost effective it is not though when compared to the cost of many bikes on the market that come with a 7 or 8 speed stock.

I have an Amsterdam for the sole purpose of carrying a bobike mini child seat (which mounts to a 1" theaded stem). While it works for what I use it for, I would never want to commute daily on the bike. The slight pedal-forward design really bugs me when I try to go faster than a comfortable, easy pace.

I understand this is a personal preference thing though.