This may sound unbelievable to some but after fly fishing for more than 20 years I have recently become a convert to double taper fly lines. Before last year I was a dyed-in-the-wool weight forward guy but now I use DT?s for 95% of my trout fishing which leads me to a stupid question; when do YOU reverse your DT line:

When the front half is worn

Once each season or at some other semi-regular interval

I even had some guy suggest after EACH use; like I do with my bamboo rod tips. (That suggestion was quickly discarded by me with the comment: ?NO, (expletive deleted), WAY!

A consensus from the long time DT devotees would be appreciated.