I am not sure about the exact numbers of people on the forum. It seems to me about half do 24 weeks and about half do 48 weeks. We have had a lot of people do 48 weeks because they have cirrhosis, were previous null or partial responders, or they were still DET at week 4 of Tx.
If you want to look at some of the stats for people on the forum go to Frijole's profile page and click on the white sheets. Those are spreadsheets and they contain the stats of many of the people on the forum who did Triple Tx. You will see many SVRs coming in now.
http://www.medhelp.org/personal_pages/user/223152
The stats include Genotype (mostly Geno 1), fibrosis stage, previous Tx experience, starting VL, VL at various points, side effects.
For the record, I did 48 because I was still DET at week 4.