I like my nubster because it fills the empty slot,but it is too small to do anything that I would notice.i just hated the empty box.i don't surf well enough to see that it does anything.neither would 99% of surfers.
yeah i got a 5 fin stewart s winger, at first i tried it as a 3 and quad but its really meant to have that 5 fin. the more you get on and surf with it the more you'll get used to it. it always would feel like to me that it was harder to turn at first.
I throw a nubster in in the back on my small wave board if I'm surfing it on bigger, and especially steeper, days. Definitely think it adds a bit of stability on steep drops when you've got to make a bit harder of a bottom turn
the knubster does add a slight bit of stability. I found it pretty useless on my couch potato because it doesn't have enough rocker to handle waves that need much stability. If the motivator has enough rocker to handle a steep wave, then, yeah, I'd put the knubster in on those days