This is a somewhat unbiased opinion (check my url and guess

) But here's what i think at first glance, not to be offending either seller.
The slick stick is definately sturdier and is built for the long haul. Oscar's spinners look slapped together compared to how well this one is built.
Unfortunately I think it's a bit "over-desigend." A ball bearing spinner is overkill for any game i've ever seen as the games don't want the spinner to spin forever... as a mattter of fact, after a second or two the "cursor" (excuse my lack of terminology here) will reach the end of the screen. A good spinner has a good blanace so that spins freely, but is easy to stop without putting a hard hand to it. I think Switching directions might cause a bit more "back wobble" on this spinner than usual as you would have to physically stop it, which might be hard after it's built up some speed.
Also the encoder wheel ratio seems a tad small to me. The model 3 would almost definaely be more accurate. The accuracy of this spinner looks to be comparable to the model 1.
But this is just from looking at the pictures so it's just speculation.
Also regarding the price, considering how much money would have to be spent to create one of those it's about right, but as I said, I think some of that durability and smoothness is overkill.
Now what this rig would be good for is a steering wheel. Wheels put a lot of pressure on the shaft and that bearing on the end would definately keep it in line and running smoothly if you could manage a way to mount it on your cp.
Just my 2 cents.