Lee, you have used a 2" straight tube stair wand that was not a Stanley Steemer wand (cause it's totally different)?
I ask because I had a single bend stair tool, and a UT-40 straight on the truck, the straight is just more universal, especially if you happen to have a
glide on it.
You are already comfy with your swivel, so you should stay with it, my appeal is to those who are looking for a new tool.
I will say that the swivel tool has a few drawbacks in my eyes.
#1 the forward handle is fixed, you grab it there and that is it. ON the straight tool you have almost 18" of insulated tube to hold the tool by, you can place your forward hand anywhere, very handy.
#2 because the head swivels you can only "leverage" so much, there is something to be said for the 40" tool being solid, it's really good on risers.
#3 the swivel is only a 30" tool, a 40" tool allows you to clean stairs standing up, very nice on the back, not so nice in a pie shaped radius stairway, trade offs?.
The forward hand position ends up being a big deal.
I'm amazed how many don't put a glide on their stair tool, it's the answer for cleaning bullnose steps better, a radius on a radius, I think this may be part of the technique you refer to on bullnose extraction, it's just easier with a radius tool.
I could go into the FeatherTouch valve, but everyone here knows about that already, and the advantage of high flow jets with checkvalves, teh standard PMF valve on that 30" tools plain and simply stinks.
Other than that it's just another tool.