I purchased this afternoon, the new Echo 3106 Glass.
I wanted a TH rod for really ultra light weight lines.
Tested several WF4F lines.
DT4F old SA Mastery - not very impressed with the casting.
WF4F old SA Mastery - better but not great.
WF4F SA Nymph Line - This line worked on the 3wt glass rod. Nice T&G single spey however, still on the light side.
In addition, I tested the new RIO
Scandi Short in 180gr,,, this is an excellent line for longer distance casting with small flies.
Tomorrow I will test cast some of my RIO
Trout LT lines,,, I suspect the WF5F and WF6F will be smooth casting on this rod.