I like the discussions in this thread--it seems at least that it might cause people to think twice before *switching* their drivetrain at expense and trouble simply for the alleged benefits of internal gearing for commuting. Even the retrogrouches can appreciate that kind of posing.

I looked up some weights and prices for rough comparison. Feel free to point out weaknesses here. I used Deore XT components since they're all still available in 8 speed. Most prices off nashbar or airbomb.com.

Internal: Premium SG-8R25 $199.99 1550 g


Derailleur: Shimano deore XT 8sp cassette 39.99 256g
Shimano deore XT RD 54.99 255g
Shimano deore XT rear hub 59.99 432g
Weight difference for 20% less chain= 334g/5= 66.8g
total=986.8g

Price: $154.97

PS I might add that I have sheared a (nice XT) derailleur in my spokes cranking uphill during the winter commute.