The FMX Keiryu stiff 62 is smoother casting and more capable than the 54. I don't know what the upper limit on catches will be, but I am pretty sure the rod will handle any trout or bass the average angler will ever hook. It is a bit heavier than the Keiryu Sawanobori 63, but the Keiryu Sawanobori 63 is a bit more expensive.The FMX Keiryu stiff is lighter than the Field Master 62 (which I always fished at full extension anyway) and it is much lighter than the Nissin 2-Way 620ZX stiff.
If you are fishing the Madison, or the White, or the Delaware, or the Snake, or any larger river that has a healthy trout population, you could hook a fish that would be a once in a lifetime catch. No reason not to fish with a rod that could handle it.
Suntech FMX Keiryu Stiff 62
Length extended – 20’ 9”
Length collapsed – 21.5”
Weight with tip cap – 6.3 oz
Weight without cap – 5.5 oz
Sections - 14
Tip Diameter – .7mm
Grip Diameter – 24.6mm
Tippet rating – 7X-5X
% Carbon – 96