Feels very nice, especially if the preceding pattern happens to move in at least a clockwise/anticlockwise motion, making the spinner feel like a natural continuation of the pattern. For me, this sensation becomes more apparent if the spinner comes right after a sweeping slider. Mmmm, yes. I enjoy using this.
Of course, if there's an overly complicated pattern right before the spinner and then the spinner acting as a glorified slider, then that's not so good.
D33d's #1 personal mapping rule: Use common sense. If something can not be justified with this, with the only reason being, "I'm being creative," then you are fabricating a bullshit-shaped house of cards on the San Andreas Fault.
I've been incredibly busy over the past couple of weeks and I'll still be busy this week. PM me for anything that's really important.