I have been thinking of a new Trout Rod. I mainly fish the White River system in Arkansas. Currently my primary rod is a 9ft 4 wt. I use a 9 ft 5 wt when it's windy or I know I'll be fishing a bit longer distances. I have been thinking of a 10ft 4wt. I think the extra ft would be nice for mending etc. I can't think of any disadvantages other than possibly the tip feeling heavier due to the length.

Any reason to not get a 10 ft?

wayne