Mike,
Loving the new Smallstream line!
In the last week I've used it in a drifting boat as well as from the bank at a rainbow fishery. It was bought for my new Guideline Fario 9' #4, and there will be a review on that later.
Boat - Lovely and accurate with wets or dries. It covers the distance that you need in a boat (ie, not huge) and does it with no fuss or effort. Rolling the line out at the end of a retrieve is easy and one false cast and you are back in the water.
Bank - Overhead, roll and wind induced spey all just work. large flies, buzzers, dries and wets all go out easily. It doesn't carry much past the rear taper but 20 yards or more is available with a little haul and on a #4 what more can you ask for?
It floats nicely too and lies straight. More importantly it lands big fish like the one in the Loch somewhere report