Got my scoops in Thursday. I ordered both the stock '10 scoop and the Ully scoop from Surdyke. I ordered both, 'cause while I like the look of the '10 scoop, I wasn't sure if it would really help much, and it was only $15 more, grand total of $65 for both shipped to Texas.
So, to give you an Idea of my comparison test, i have a 38 mile ride to work each way, going to work thats 10 miles of city, 25 miles of highway and 3 miles of county road (55 mph 2-lane blacktop). It in the opposite order coming home. My ride to work is early morning, around 85-90 degree temps, and the ride home is evening, starting at over 100, cooling to the upper 90s as the sun goes down at the end of the ride.
I put the '10 factory scoop (small one) on first, since I didn't have the 10-32 screws to mount the other one yet, and rode it to work and back on friday. After getting to work, the fan ran about the same amount as usual, no real difference noted. On the ride home however, I felt more heat off the engine than normal, and upon parking it at the house, the fan ran for even longer than usual, and the bike seemed rather hot, more so than I am used to. So, IMHO, the small scoop was if anything, less effective than the stock one. This may be because I noticed, right off, that both of the new scoops have less plastic at the rear behind the mounting screw. The stock scoop on my '03 XB9R actually went all the way back over the header pipe, and probably kept more heat from the pipe off the engine and me.
So, dissapointed, I removed the '10 scoop, and mounted the Ully scoop friday night. I rode it to work and back today, and first off, when I got to work this morning, no fan at all. Good so far. On my ride home today, which is the more important one, being much hotter, I immediately noticed less heat on my leg and butt crack, and the engine seemed happier than normal. Upon parking it, the fan did come on, but only for a very short while.
Conclusion, if you want a cooler, happier engine in this hot-as-balls Texas summer, the Ully scoop is definitely worth it. If you don't need the extra cooling, but think the scoop looks cool, go with the '10 stock scoop, it's cheap and does look nice.
On a side note, the Ully scoop doesn't fit snug up against the frame as well as the stock and the '10 factory scoop do. Now that I'm a believer, I'm gonna elongate the mounting holes a bit to get it to fit better, which could do nothing but improve it's performance and appearance.
Hope this review gives someone the extra input they needed to pull the trigger and get the scoop!