I think it is a good idea to listen to the members and especially the users of this forum.
Please vote "Old" or "New" to show what you like. Simply post a post that contains only this word to make it easier for me to follow it. Please answer to this first post only, not to a former post (which makes this thread linear).
In addition to make clear the difference: What you cannot do in the 'new' version is to read a thread, leave it for two days after maybe 20 posts, come back after these two days and simply scroll to the 21st post and start reading and get all the new posts. New posts could have been added to the 5th, the 7th, the 12th ect. post. You have to read from the beginning to find ALL the NEW posts now (if you have not subscribed to the thread for email notifications). I'm not sure if everybody has realized this. (I know from other forums how it works). I think the 'new' version looks quite nice, but I think technically it doesn't work for heavy readers like me who wants to read everything on the interesting threads.
PLEASE: No comments. Just "new" or "old"! If you want to comment use the forum post "New Forum UI, ...".
I'll update this first post regarding the preferences of the users.